997637530 has 16 divisors (see below), whose sum is σ = 1796977224. Its totient is φ = 398781760.

The previous prime is 997637527. The next prime is 997637551. The reversal of 997637530 is 35736799.

It can be written as a sum of positive squares in 4 ways, for example, as 804232881 + 193404649 = 28359^2 + 13907^2 .

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, 18481 + ... + 48340.

Almost surely, 2^997637530 is an apocalyptic number.

997637530 is a deficient number, since it is larger than the sum of its proper divisors (799339694).

997637530 is a wasteful number, since it uses less digits than its factorization.

997637530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68321.

The product of its (nonzero) digits is 1071630, while the sum is 49.

The square root of 997637530 is about 31585.4005831808. The cubic root of 997637530 is about 999.2118890443.

The spelling of 997637530 in words is "nine hundred ninety-seven million, six hundred thirty-seven thousand, five hundred thirty".