997987580 has 12 divisors (see below), whose sum is σ = 2095773960. Its totient is φ = 399195024.

The previous prime is 997987577. The next prime is 997987583. The reversal of 997987580 is 85789799.

It is an interprime number because it is at equal distance from previous prime (997987577) and next prime (997987583).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997987583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24949670 + ... + 24949709.

It is an arithmetic number, because the mean of its divisors is an integer number (174647830).

Almost surely, 2^997987580 is an apocalyptic number.

It is an amenable number.

997987580 is an abundant number, since it is smaller than the sum of its proper divisors (1097786380).

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

997987580 is a wasteful number, since it uses less digits than its factorization.

997987580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49899388 (or 49899386 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 62.

The square root of 997987580 is about 31590.9414231358. The cubic root of 997987580 is about 999.3287428480.

The spelling of 997987580 in words is "nine hundred ninety-seven million, nine hundred eighty-seven thousand, five hundred eighty".