697393440 has 72 divisors (see below), whose sum is σ = 2379860028. Its totient is φ = 185971200.

The previous prime is 697393439. The next prime is 697393447. The reversal of 697393440 is 44393796.

It can be written as a sum of positive squares in 2 ways, for example, as 599858064 + 97535376 = 24492^2 + 9876^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×697393440² = 972715220310067200, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (697393447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240711 + ... + 243590.

Almost surely, 2^697393440 is an apocalyptic number.

697393440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

697393440 is an abundant number, since it is smaller than the sum of its proper divisors (1682466588).

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

697393440 is a wasteful number, since it uses less digits than its factorization.

697393440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484322 (or 484311 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 697393440 is about 26408.2078149957. The cubic root of 697393440 is about 886.8005476195.

The spelling of 697393440 in words is "six hundred ninety-seven million, three hundred ninety-three thousand, four hundred forty".