77471681 has 8 divisors (see below), whose sum is σ = 90598464. Its totient is φ = 64859760.

The previous prime is 77471677. The next prime is 77471699. The reversal of 77471681 is 18617477.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77471681 - 2² = 77471677 is a prime.

It is a super-2 number, since 2×77471681² = 12003722713931522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77471621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128390 + ... + 128991.

It is an arithmetic number, because the mean of its divisors is an integer number (11324808).

Almost surely, 2^77471681 is an apocalyptic number.

It is an amenable number.

77471681 is a deficient number, since it is larger than the sum of its proper divisors (13126783).

77471681 is a wasteful number, since it uses less digits than its factorization.

77471681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257431.

The product of its digits is 65856, while the sum is 41.

The square root of 77471681 is about 8801.7998727533. The cubic root of 77471681 is about 426.2990123751.

The spelling of 77471681 in words is "seventy-seven million, four hundred seventy-one thousand, six hundred eighty-one".