64638015 has 32 divisors (see below), whose sum is σ = 111767040. Its totient is φ = 31710336.

The previous prime is 64637977. The next prime is 64638031. The reversal of 64638015 is 51083646.

It is not a de Polignac number, because 64638015 - 2¹⁶ = 64572479 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97756 + ... + 98414.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^64638015 is an apocalyptic number.

64638015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64638015 is a deficient number, since it is larger than the sum of its proper divisors (47129025).

64638015 is a wasteful number, since it uses less digits than its factorization.

64638015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 64638015 is about 8039.7770491476. Note that the first 3 decimals coincide. The cubic root of 64638015 is about 401.3248052998.

The spelling of 64638015 in words is "sixty-four million, six hundred thirty-eight thousand, fifteen".