64928815 has 8 divisors (see below), whose sum is σ = 89045280. Its totient is φ = 44522592.

The previous prime is 64928807. The next prime is 64928837. The reversal of 64928815 is 51882946.

It is a happy number.

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 64928815 - 2³ = 64928807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 927520 + ... + 927589.

It is an arithmetic number, because the mean of its divisors is an integer number (11130660).

Almost surely, 2^64928815 is an apocalyptic number.

64928815 is a deficient number, since it is larger than the sum of its proper divisors (24116465).

64928815 is a wasteful number, since it uses less digits than its factorization.

64928815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855121.

The product of its digits is 138240, while the sum is 43.

The square root of 64928815 is about 8057.8418326497. The cubic root of 64928815 is about 401.9257451358.

The spelling of 64928815 in words is "sixty-four million, nine hundred twenty-eight thousand, eight hundred fifteen".