64768815 has 60 divisors (see below), whose sum is σ = 122813064. Its totient is φ = 32651424.

The previous prime is 64768741. The next prime is 64768817. The reversal of 64768815 is 51886746.

It is a happy number.

It is not a de Polignac number, because 64768815 - 2⁸ = 64768559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64768817) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 145984 + ... + 146426.

Almost surely, 2^64768815 is an apocalyptic number.

64768815 is a deficient number, since it is larger than the sum of its proper divisors (58044249).

64768815 is a wasteful number, since it uses less digits than its factorization.

64768815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498 (or 470 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 64768815 is about 8047.9074920131. The cubic root of 64768815 is about 401.5953267890.

The spelling of 64768815 in words is "sixty-four million, seven hundred sixty-eight thousand, eight hundred fifteen".