64542723630 has 64 divisors (see below), whose sum is σ = 193125247488. Its totient is φ = 13411474560.

The previous prime is 64542723593. The next prime is 64542723649. The reversal of 64542723630 is 3632724546.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13967977 + ... + 13972596.

It is an arithmetic number, because the mean of its divisors is an integer number (3017581992).

Almost surely, 2^64542723630 is an apocalyptic number.

64542723630 is an abundant number, since it is smaller than the sum of its proper divisors (128582523858).

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

64542723630 is a wasteful number, since it uses less digits than its factorization.

64542723630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27940601.

The product of its (nonzero) digits is 725760, while the sum is 42.

The spelling of 64542723630 in words is "sixty-four billion, five hundred forty-two million, seven hundred twenty-three thousand, six hundred thirty".