64444000620 has 48 divisors (see below), whose sum is σ = 183847799520. Its totient is φ = 16860819456.

The previous prime is 64444000591. The next prime is 64444000657. The reversal of 64444000620 is 2600044446.

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

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, 10129525 + ... + 10135884.

It is an arithmetic number, because the mean of its divisors is an integer number (3830162490).

Almost surely, 2^64444000620 is an apocalyptic number.

64444000620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64444000620 is an abundant number, since it is smaller than the sum of its proper divisors (119403798900).

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

64444000620 is a wasteful number, since it uses less digits than its factorization.

64444000620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20265474 (or 20265472 counting only the distinct ones).

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

The spelling of 64444000620 in words is "sixty-four billion, four hundred forty-four million, six hundred twenty", and thus it is an aban number.