64220620440 has 64 divisors (see below), whose sum is σ = 192698012160. Its totient is φ = 17122285440.

The previous prime is 64220620421. The next prime is 64220620459. The reversal of 64220620440 is 4402602246.

It is an interprime number because it is at equal distance from previous prime (64220620421) and next prime (64220620459).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64220620398 and 64220620407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630255 + ... + 725025.

It is an arithmetic number, because the mean of its divisors is an integer number (3010906440).

Almost surely, 2^64220620440 is an apocalyptic number.

64220620440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64220620440 is an abundant number, since it is smaller than the sum of its proper divisors (128477391720).

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

64220620440 is a wasteful number, since it uses less digits than its factorization.

64220620440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100432 (or 100428 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The spelling of 64220620440 in words is "sixty-four billion, two hundred twenty million, six hundred twenty thousand, four hundred forty".