420256645872 has 80 divisors (see below), whose sum is σ = 1242120594432. Its totient is φ = 119941436160.

The previous prime is 420256645849. The next prime is 420256645943. The reversal of 420256645872 is 278546652024.

It is a super-2 number, since 2×420256645872² (a number of 24 digits) contains 22 as substring.

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, 380383 + ... + 992574.

Almost surely, 2^420256645872 is an apocalyptic number.

420256645872 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

420256645872 is an abundant number, since it is smaller than the sum of its proper divisors (821863948560).

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

420256645872 is a wasteful number, since it uses less digits than its factorization.

420256645872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373886 (or 1373880 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 51.

The spelling of 420256645872 in words is "four hundred twenty billion, two hundred fifty-six million, six hundred forty-five thousand, eight hundred seventy-two".