64537506 has 32 divisors (see below), whose sum is σ = 156456000. Its totient is φ = 19556640.

The previous prime is 64537493. The next prime is 64537523. The reversal of 64537506 is 60573546.

64537506 is a `hidden beast` number, since 645 + 3 + 7 + 5 + 0 + 6 = 666.

64537506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53731 + ... + 54918.

It is an arithmetic number, because the mean of its divisors is an integer number (4889250).

Almost surely, 2^64537506 is an apocalyptic number.

64537506 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64537506 is an abundant number, since it is smaller than the sum of its proper divisors (91918494).

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

64537506 is a wasteful number, since it uses less digits than its factorization.

64537506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108671 (or 108665 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The square root of 64537506 is about 8033.5238843237. The cubic root of 64537506 is about 401.1166838088.

The spelling of 64537506 in words is "sixty-four million, five hundred thirty-seven thousand, five hundred six".