697238640 has 180 divisors, whose sum is σ = 2723993064. Its totient is φ = 159360768.

The previous prime is 697238609. The next prime is 697238669. The reversal of 697238640 is 46832796.

It is a tau number, because it is divible by the number of its divisors (180).

It is a super-2 number, since 2×697238640² = 972283442218099200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 25399 + ... + 45161.

Almost surely, 2^697238640 is an apocalyptic number.

697238640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 697238640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361996532).

697238640 is an abundant number, since it is smaller than the sum of its proper divisors (2026754424).

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

697238640 is a wasteful number, since it uses less digits than its factorization.

697238640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19796 (or 19780 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 697238640 is about 26405.2767453780. The cubic root of 697238640 is about 886.7349285704.

The spelling of 697238640 in words is "six hundred ninety-seven million, two hundred thirty-eight thousand, six hundred forty".