64515975 has 48 divisors (see below), whose sum is σ = 111504768. Its totient is φ = 32883840.

The previous prime is 64515973. The next prime is 64515977. The reversal of 64515975 is 57951546.

It is an interprime number because it is at equal distance from previous prime (64515973) and next prime (64515977).

It is not a de Polignac number, because 64515975 - 2¹ = 64515973 is a prime.

It is a super-2 number, since 2×64515975² = 8324622060401250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64515973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 185752 + ... + 186098.

It is an arithmetic number, because the mean of its divisors is an integer number (2323016).

Almost surely, 2^64515975 is an apocalyptic number.

64515975 is a deficient number, since it is larger than the sum of its proper divisors (46988793).

64515975 is a wasteful number, since it uses less digits than its factorization.

64515975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 459 counting only the distinct ones).

The product of its digits is 189000, while the sum is 42.

The square root of 64515975 is about 8032.1837005885. The cubic root of 64515975 is about 401.0720720037.

The spelling of 64515975 in words is "sixty-four million, five hundred fifteen thousand, nine hundred seventy-five".