64138015 has 16 divisors (see below), whose sum is σ = 82396800. Its totient is φ = 47781792.

The previous prime is 64137979. The next prime is 64138031. The reversal of 64138015 is 51083146.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64138015 is a prime.

It is a super-2 number, since 2×64138015² = 8227369936280450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117 + ... + 11326.

It is an arithmetic number, because the mean of its divisors is an integer number (5149800).

Almost surely, 2^64138015 is an apocalyptic number.

64138015 is a deficient number, since it is larger than the sum of its proper divisors (18258785).

64138015 is a wasteful number, since it uses less digits than its factorization.

64138015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11526.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 64138015 is about 8008.6212920827. The cubic root of 64138015 is about 400.2873248117.

The spelling of 64138015 in words is "sixty-four million, one hundred thirty-eight thousand, fifteen".