425621644 has 72 divisors (see below), whose sum is σ = 892151232. Its totient is φ = 177085440.

The previous prime is 425621621. The next prime is 425621653. The reversal of 425621644 is 446126524.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1159549 + ... + 1159915.

Almost surely, 2^425621644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 425621644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446075616).

425621644 is an abundant number, since it is smaller than the sum of its proper divisors (466529588).

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

425621644 is a wasteful number, since it uses less digits than its factorization.

425621644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 534 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The square root of 425621644 is about 20630.5997004450. The cubic root of 425621644 is about 752.2136931366.

The spelling of 425621644 in words is "four hundred twenty-five million, six hundred twenty-one thousand, six hundred forty-four".