64920897 has 12 divisors (see below), whose sum is σ = 95312724. Its totient is φ = 42570720.

The previous prime is 64920893. The next prime is 64920907. The reversal of 64920897 is 79802946.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16353936 + 48566961 = 4044^2 + 6969^2 .

It is not a de Polignac number, because 64920897 - 2² = 64920893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64920893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58578 + ... + 59675.

It is an arithmetic number, because the mean of its divisors is an integer number (7942727).

Almost surely, 2^64920897 is an apocalyptic number.

It is an amenable number.

64920897 is a deficient number, since it is larger than the sum of its proper divisors (30391827).

64920897 is a wasteful number, since it uses less digits than its factorization.

64920897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118320 (or 118317 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 64920897 is about 8057.3504950449. The cubic root of 64920897 is about 401.9094063324.

The spelling of 64920897 in words is "sixty-four million, nine hundred twenty thousand, eight hundred ninety-seven".