64536380 has 24 divisors (see below), whose sum is σ = 137386032. Its totient is φ = 25460352.

The previous prime is 64536371. The next prime is 64536391. The reversal of 64536380 is 8363546.

It is a self number, because there is not a number n which added to its sum of digits gives 64536380.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20642 + ... + 23561.

It is an arithmetic number, because the mean of its divisors is an integer number (5724418).

Almost surely, 2^64536380 is an apocalyptic number.

It is an amenable number.

64536380 is an abundant number, since it is smaller than the sum of its proper divisors (72849652).

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

64536380 is a wasteful number, since it uses less digits than its factorization.

64536380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44285 (or 44283 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 64536380 is about 8033.4538026928. The cubic root of 64536380 is about 401.1143510051.

The spelling of 64536380 in words is "sixty-four million, five hundred thirty-six thousand, three hundred eighty".