997696687 has 8 divisors (see below), whose sum is σ = 1075025504. Its totient is φ = 920451168.

The previous prime is 997696673. The next prime is 997696703. The reversal of 997696687 is 786696799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 997696687 - 2¹¹ = 997694639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997696607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5278 + ... + 44980.

It is an arithmetic number, because the mean of its divisors is an integer number (134378188).

Almost surely, 2^997696687 is an apocalyptic number.

997696687 is a deficient number, since it is larger than the sum of its proper divisors (77328817).

997696687 is a wasteful number, since it uses less digits than its factorization.

With its successor (997696688) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (41649).

997696687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41649.

The product of its digits is 61725888, while the sum is 67.

The square root of 997696687 is about 31586.3370304314. The cubic root of 997696687 is about 999.2316387722.

The spelling of 997696687 in words is "nine hundred ninety-seven million, six hundred ninety-six thousand, six hundred eighty-seven".