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64947481 = 80592
BaseRepresentation
bin1111011111000…
…0010100011001
311112012200012021
43313300110121
5113111304411
610240014441
71416021154
oct367602431
9145180167
1064947481
1133730005
1219901421
13105bcb81
1488a8c9b
155a7da71
hex3df0519

64947481 has 3 divisors (see below), whose sum is σ = 64955541. Its totient is φ = 64939422.

The previous prime is 64947479. The next prime is 64947499. The reversal of 64947481 is 18474946.

The square root of 64947481 is 8059.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 64947481 - 21 = 64947479 is a prime.

It is a super-2 number, since 2×649474812 = 8436350576490722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64947451) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4030 + ... + 12088.

It is an arithmetic number, because the mean of its divisors is an integer number (21651847).

Almost surely, 264947481 is an apocalyptic number.

64947481 is the 8059-th square number.

64947481 is the 4030-th centered octagonal number.

It is an amenable number.

64947481 is a deficient number, since it is larger than the sum of its proper divisors (8060).

64947481 is an frugal number, since it uses more digits than its factorization.

64947481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16118 (or 8059 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The cubic root of 64947481 is about 401.9642571952.

The spelling of 64947481 in words is "sixty-four million, nine hundred forty-seven thousand, four hundred eighty-one".

Divisors: 1 8059 64947481