64515550 has 48 divisors (see below), whose sum is σ = 134147664. Its totient is φ = 22880000.

The previous prime is 64515533. The next prime is 64515551. The reversal of 64515550 is 5551546.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64515551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21120 + ... + 23980.

It is an arithmetic number, because the mean of its divisors is an integer number (2794743).

Almost surely, 2^64515550 is an apocalyptic number.

64515550 is an abundant number, since it is smaller than the sum of its proper divisors (69632114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64515550 is a wasteful number, since it uses less digits than its factorization.

64515550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925 (or 2920 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 64515550 is about 8032.1572444767. The cubic root of 64515550 is about 401.0711913122.

The spelling of 64515550 in words is "sixty-four million, five hundred fifteen thousand, five hundred fifty".