64020015 has 24 divisors (see below), whose sum is σ = 112853520. Its totient is φ = 33563904.

The previous prime is 64020013. The next prime is 64020031. The reversal of 64020015 is 51002046.

It is a happy number.

64020015 is a `hidden beast` number, since 640 + 20 + 0 + 1 + 5 = 666.

It is not a de Polignac number, because 64020015 - 2¹ = 64020013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64020015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64020013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9402 + ... + 14711.

It is an arithmetic number, because the mean of its divisors is an integer number (4702230).

Almost surely, 2^64020015 is an apocalyptic number.

64020015 is a deficient number, since it is larger than the sum of its proper divisors (48833505).

64020015 is a wasteful number, since it uses less digits than its factorization.

64020015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24183 (or 24180 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 64020015 is about 8001.2508397125. The cubic root of 64020015 is about 400.0416935706.

The spelling of 64020015 in words is "sixty-four million, twenty thousand, fifteen".