64437576820 has 24 divisors (see below), whose sum is σ = 135800485128. Its totient is φ = 25683302400.

The previous prime is 64437576817. The next prime is 64437576823. The reversal of 64437576820 is 2867573446.

It is an interprime number because it is at equal distance from previous prime (64437576817) and next prime (64437576823).

It can be written as a sum of positive squares in 4 ways, for example, as 26976748516 + 37460828304 = 164246^2 + 193548^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64437576823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5727261 + ... + 5738500.

It is an arithmetic number, because the mean of its divisors is an integer number (5658353547).

Almost surely, 2^64437576820 is an apocalyptic number.

It is an amenable number.

64437576820 is an abundant number, since it is smaller than the sum of its proper divisors (71362908308).

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

64437576820 is a wasteful number, since it uses less digits than its factorization.

64437576820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11466051 (or 11466049 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 52.

The spelling of 64437576820 in words is "sixty-four billion, four hundred thirty-seven million, five hundred seventy-six thousand, eight hundred twenty".