64420440444624 has 80 divisors (see below), whose sum is σ = 181550613302784. Its totient is φ = 19521119856000.

The previous prime is 64420440444601. The next prime is 64420440444643. The reversal of 64420440444624 is 42644404402446.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 48207787 + ... + 49526069.

Almost surely, 2^{64420440444624} is an apocalyptic number.

It is an amenable number.

64420440444624 is an abundant number, since it is smaller than the sum of its proper divisors (117130172858160).

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

64420440444624 is a wasteful number, since it uses less digits than its factorization.

64420440444624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410856 (or 1410850 counting only the distinct ones).

The product of its (nonzero) digits is 9437184, while the sum is 48.

The spelling of 64420440444624 in words is "sixty-four trillion, four hundred twenty billion, four hundred forty million, four hundred forty-four thousand, six hundred twenty-four".