691680942 has 24 divisors (see below), whose sum is σ = 1509586416. Its totient is φ = 228876576.

The previous prime is 691680931. The next prime is 691680961. The reversal of 691680942 is 249086196.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137778 + ... + 142709.

It is an arithmetic number, because the mean of its divisors is an integer number (62899434).

Almost surely, 2^691680942 is an apocalyptic number.

691680942 is an abundant number, since it is smaller than the sum of its proper divisors (817905474).

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

691680942 is a wasteful number, since it uses less digits than its factorization.

691680942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280632 (or 280629 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 691680942 is about 26299.8277941130. The cubic root of 691680942 is about 884.3725822073.

The spelling of 691680942 in words is "six hundred ninety-one million, six hundred eighty thousand, nine hundred forty-two".