425626640 has 40 divisors (see below), whose sum is σ = 991805568. Its totient is φ = 169868160.

The previous prime is 425626639. The next prime is 425626673. The reversal of 425626640 is 46626524.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 425626640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31295 + ... + 42785.

Almost surely, 2^425626640 is an apocalyptic number.

425626640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

425626640 is an abundant number, since it is smaller than the sum of its proper divisors (566178928).

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

425626640 is a wasteful number, since it uses less digits than its factorization.

425626640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11967 (or 11961 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 425626640 is about 20630.7207823673. The cubic root of 425626640 is about 752.2166363178.

The spelling of 425626640 in words is "four hundred twenty-five million, six hundred twenty-six thousand, six hundred forty".