64020615 has 16 divisors (see below), whose sum is σ = 106887168. Its totient is φ = 32659616.

The previous prime is 64020599. The next prime is 64020631. The reversal of 64020615 is 51602046.

It is an interprime number because it is at equal distance from previous prime (64020599) and next prime (64020631).

It is a cyclic number.

It is not a de Polignac number, because 64020615 - 2⁴ = 64020599 is a prime.

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, 92439 + ... + 93128.

It is an arithmetic number, because the mean of its divisors is an integer number (6680448).

Almost surely, 2^64020615 is an apocalyptic number.

64020615 is a deficient number, since it is larger than the sum of its proper divisors (42866553).

64020615 is a wasteful number, since it uses less digits than its factorization.

64020615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185598.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 64020615 is about 8001.2883337623. The cubic root of 64020615 is about 400.0429433062.

The spelling of 64020615 in words is "sixty-four million, twenty thousand, six hundred fifteen".