697138608 has 90 divisors (see below), whose sum is σ = 1869075684. Its totient is φ = 223903872.

The previous prime is 697138597. The next prime is 697138613. The reversal of 697138608 is 806831796.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6768285 + ... + 6768387.

Almost surely, 2^697138608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 697138608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934537842).

697138608 is an abundant number, since it is smaller than the sum of its proper divisors (1171937076).

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

697138608 is a wasteful number, since it uses less digits than its factorization.

697138608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 697138608 is about 26403.3825105800. The cubic root of 697138608 is about 886.6925202730.

Multiplying 697138608 by its sum of digits (48), we get a square (33462653184 = 182928²).

697138608 divided by its sum of digits (48) gives a square (14523721 = 3811²).

The spelling of 697138608 in words is "six hundred ninety-seven million, one hundred thirty-eight thousand, six hundred eight".