64677397 has 4 divisors (see below), whose sum is σ = 64706860. Its totient is φ = 64647936.

The previous prime is 64677383. The next prime is 64677409. The reversal of 64677397 is 79377646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23126481 + 41550916 = 4809^2 + 6446^2 .

It is a cyclic number.

It is not a de Polignac number, because 64677397 - 2²³ = 56288789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64677397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64677307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11148 + ... + 15925.

It is an arithmetic number, because the mean of its divisors is an integer number (16176715).

Almost surely, 2^64677397 is an apocalyptic number.

It is an amenable number.

64677397 is a deficient number, since it is larger than the sum of its proper divisors (29463).

64677397 is a wasteful number, since it uses less digits than its factorization.

64677397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29462.

The product of its digits is 1333584, while the sum is 49.

The square root of 64677397 is about 8042.2258734756. The cubic root of 64677397 is about 401.4062938003.

The spelling of 64677397 in words is "sixty-four million, six hundred seventy-seven thousand, three hundred ninety-seven".