696734640 has 120 divisors (see below), whose sum is σ = 2674153248. Its totient is φ = 159252480.

The previous prime is 696734611. The next prime is 696734659. The reversal of 696734640 is 46437696.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64081 + ... + 74160.

Almost surely, 2^696734640 is an apocalyptic number.

696734640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

696734640 is an abundant number, since it is smaller than the sum of its proper divisors (1977418608).

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

696734640 is a wasteful number, since it uses less digits than its factorization.

696734640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138267 (or 138258 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The square root of 696734640 is about 26395.7314731000. The cubic root of 696734640 is about 886.5212178426.

The spelling of 696734640 in words is "six hundred ninety-six million, seven hundred thirty-four thousand, six hundred forty".