64542506 has 48 divisors (see below), whose sum is σ = 125582400. Its totient is φ = 24651648.

The previous prime is 64542503. The next prime is 64542509. The reversal of 64542506 is 60524546.

It is an interprime number because it is at equal distance from previous prime (64542503) and next prime (64542509).

It is a super-3 number, since 3×64542506³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64542503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30635 + ... + 32673.

It is an arithmetic number, because the mean of its divisors is an integer number (2616300).

Almost surely, 2^64542506 is an apocalyptic number.

64542506 is a deficient number, since it is larger than the sum of its proper divisors (61039894).

64542506 is a wasteful number, since it uses less digits than its factorization.

64542506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091 (or 2084 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 64542506 is about 8033.8350742345. The cubic root of 64542506 is about 401.1270422900.

The spelling of 64542506 in words is "sixty-four million, five hundred forty-two thousand, five hundred six".