997601290 has 96 divisors (see below), whose sum is σ = 2161494720. Its totient is φ = 330333696.

The previous prime is 997601279. The next prime is 997601291. The reversal of 997601290 is 92106799.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (997601291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2380701 + ... + 2381119.

It is an arithmetic number, because the mean of its divisors is an integer number (22515570).

Almost surely, 2^997601290 is an apocalyptic number.

997601290 is an abundant number, since it is smaller than the sum of its proper divisors (1163893430).

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

997601290 is a wasteful number, since it uses less digits than its factorization.

997601290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 997601290 is about 31584.8268952040. The cubic root of 997601290 is about 999.1997898345.

The spelling of 997601290 in words is "nine hundred ninety-seven million, six hundred one thousand, two hundred ninety".