426638772 has 96 divisors (see below), whose sum is σ = 1276620800. Its totient is φ = 120691296.

The previous prime is 426638767. The next prime is 426638813. The reversal of 426638772 is 277836624.

426638772 is a `hidden beast` number, since 4 + 2 + 6 + 638 + 7 + 7 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75129 + ... + 80607.

Almost surely, 2^426638772 is an apocalyptic number.

426638772 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 426638772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638310400).

426638772 is an abundant number, since it is smaller than the sum of its proper divisors (849982028).

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

426638772 is a wasteful number, since it uses less digits than its factorization.

426638772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5602 (or 5594 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 426638772 is about 20655.2359463648. The cubic root of 426638772 is about 752.8124165683.

The spelling of 426638772 in words is "four hundred twenty-six million, six hundred thirty-eight thousand, seven hundred seventy-two".