64749547 has 8 divisors (see below), whose sum is σ = 67737600. Its totient is φ = 61811904.

The previous prime is 64749541. The next prime is 64749557. The reversal of 64749547 is 74594746.

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

It is a cyclic number.

It is not a de Polignac number, because 64749547 - 2³ = 64749539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64749497 and 64749506.

It is not an unprimeable number, because it can be changed into a prime (64749541) 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, 9963 + ... + 15124.

It is an arithmetic number, because the mean of its divisors is an integer number (8467200).

Almost surely, 2^64749547 is an apocalyptic number.

64749547 is a deficient number, since it is larger than the sum of its proper divisors (2988053).

64749547 is a wasteful number, since it uses less digits than its factorization.

64749547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25205.

The product of its digits is 846720, while the sum is 46.

The square root of 64749547 is about 8046.7103216159. The cubic root of 64749547 is about 401.5554994626. Note that the first 3 decimals are identical.

The spelling of 64749547 in words is "sixty-four million, seven hundred forty-nine thousand, five hundred forty-seven".