64891015 has 8 divisors (see below), whose sum is σ = 88993440. Its totient is φ = 44496672.

The previous prime is 64890983. The next prime is 64891033. The reversal of 64891015 is 51019846.

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 64891015 - 2⁵ = 64890983 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, 926980 + ... + 927049.

It is an arithmetic number, because the mean of its divisors is an integer number (11124180).

Almost surely, 2^64891015 is an apocalyptic number.

64891015 is a deficient number, since it is larger than the sum of its proper divisors (24102425).

64891015 is a wasteful number, since it uses less digits than its factorization.

64891015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854041.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 64891015 is about 8055.4959499711. The cubic root of 64891015 is about 401.8477328162.

The spelling of 64891015 in words is "sixty-four million, eight hundred ninety-one thousand, fifteen".