425721628 has 12 divisors (see below), whose sum is σ = 777404880. Its totient is φ = 203605952.

The previous prime is 425721617. The next prime is 425721631. The reversal of 425721628 is 826127524.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2313613 + ... + 2313796.

It is an arithmetic number, because the mean of its divisors is an integer number (64783740).

Almost surely, 2^425721628 is an apocalyptic number.

It is an amenable number.

425721628 is a deficient number, since it is larger than the sum of its proper divisors (351683252).

425721628 is a wasteful number, since it uses less digits than its factorization.

425721628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4627436 (or 4627434 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 425721628 is about 20633.0227547977. The cubic root of 425721628 is about 752.2725900830.

The spelling of 425721628 in words is "four hundred twenty-five million, seven hundred twenty-one thousand, six hundred twenty-eight".