997625440 has 48 divisors (see below), whose sum is σ = 2693591712. Its totient is φ = 342042624.

The previous prime is 997625429. The next prime is 997625471. The reversal of 997625440 is 44526799.

It is a congruent number.

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, 444249 + ... + 446488.

It is an arithmetic number, because the mean of its divisors is an integer number (56116494).

Almost surely, 2^997625440 is an apocalyptic number.

It is an amenable number.

997625440 is an abundant number, since it is smaller than the sum of its proper divisors (1695966272).

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

997625440 is a wasteful number, since it uses less digits than its factorization.

997625440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890759 (or 890751 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 997625440 is about 31585.2091967110. The cubic root of 997625440 is about 999.2078526683.

The spelling of 997625440 in words is "nine hundred ninety-seven million, six hundred twenty-five thousand, four hundred forty".