64536815 has 8 divisors (see below), whose sum is σ = 88507680. Its totient is φ = 44253792.

The previous prime is 64536809. The next prime is 64536877. The reversal of 64536815 is 51863546.

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 64536815 - 2⁶ = 64536751 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, 921920 + ... + 921989.

It is an arithmetic number, because the mean of its divisors is an integer number (11063460).

Almost surely, 2^64536815 is an apocalyptic number.

64536815 is a deficient number, since it is larger than the sum of its proper divisors (23970865).

64536815 is a wasteful number, since it uses less digits than its factorization.

64536815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843921.

The product of its digits is 86400, while the sum is 38.

The square root of 64536815 is about 8033.4808769300. The cubic root of 64536815 is about 401.1152522247.

The spelling of 64536815 in words is "sixty-four million, five hundred thirty-six thousand, eight hundred fifteen".