64547626920 has 128 divisors (see below), whose sum is σ = 221528390400. Its totient is φ = 14738927616.

The previous prime is 64547626907. The next prime is 64547626933. The reversal of 64547626920 is 2962674546.

It is an interprime number because it is at equal distance from previous prime (64547626907) and next prime (64547626933).

It is a super-2 number, since 2×64547626920² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 809482 + ... + 885638.

It is an arithmetic number, because the mean of its divisors is an integer number (1730690550).

Almost surely, 2^64547626920 is an apocalyptic number.

64547626920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64547626920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110764195200).

64547626920 is an abundant number, since it is smaller than the sum of its proper divisors (156980763480).

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

64547626920 is a wasteful number, since it uses less digits than its factorization.

64547626920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77187 (or 77183 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 64547626920 in words is "sixty-four billion, five hundred forty-seven million, six hundred twenty-six thousand, nine hundred twenty".