691275960 has 48 divisors (see below), whose sum is σ = 2246648040. Its totient is φ = 184340160.

The previous prime is 691275901. The next prime is 691275967. The reversal of 691275960 is 69572196.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691275967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 959746 + ... + 960465.

Almost surely, 2^691275960 is an apocalyptic number.

691275960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691275960 is an abundant number, since it is smaller than the sum of its proper divisors (1555372080).

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

691275960 is a wasteful number, since it uses less digits than its factorization.

691275960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920228 (or 1920221 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 691275960 is about 26292.1273388062. The cubic root of 691275960 is about 884.1999472642.

The spelling of 691275960 in words is "six hundred ninety-one million, two hundred seventy-five thousand, nine hundred sixty".