420708637472 has 18 divisors (see below), whose sum is σ = 828277353729. Its totient is φ = 210352484160.

The previous prime is 420708637451. The next prime is 420708637519. The reversal of 420708637472 is 274736807024.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 416546323216 + 4162314256 = 645404^2 + 64516^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=458644.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420708637472.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3611822 + ... + 3726482.

Almost surely, 2^420708637472 is an apocalyptic number.

It is an amenable number.

420708637472 is a deficient number, since it is larger than the sum of its proper divisors (407568716257).

420708637472 is an frugal number, since it uses more digits than its factorization.

420708637472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229332 (or 114663 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 50.

Multiplying 420708637472 by its sum of digits (50), we get a square (21035431873600 = 4586440²).

The spelling of 420708637472 in words is "four hundred twenty billion, seven hundred eight million, six hundred thirty-seven thousand, four hundred seventy-two".