64551550 has 96 divisors (see below), whose sum is σ = 153204480. Its totient is φ = 19699200.

The previous prime is 64551541. The next prime is 64551551. The reversal of 64551550 is 5515546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64551551) 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, 112765 + ... + 113335.

It is an arithmetic number, because the mean of its divisors is an integer number (1595880).

Almost surely, 2^64551550 is an apocalyptic number.

64551550 is an abundant number, since it is smaller than the sum of its proper divisors (88652930).

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

64551550 is a wasteful number, since it uses less digits than its factorization.

64551550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 621 counting only the distinct ones).

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

The square root of 64551550 is about 8034.3979239268. The cubic root of 64551550 is about 401.1457773519.

The spelling of 64551550 in words is "sixty-four million, five hundred fifty-one thousand, five hundred fifty".