691613712 has 30 divisors (see below), whose sum is σ = 1935558222. Its totient is φ = 230537856.

The previous prime is 691613711. The next prime is 691613717. The reversal of 691613712 is 217316196.

It can be written as a sum of positive squares in only one way, i.e., 630210816 + 61402896 = 25104^2 + 7836^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (691613711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2401293 + ... + 2401580.

Almost surely, 2^691613712 is an apocalyptic number.

It is an amenable number.

691613712 is an abundant number, since it is smaller than the sum of its proper divisors (1243944510).

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

691613712 is a wasteful number, since it uses less digits than its factorization.

691613712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4802887 (or 4802878 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 691613712 is about 26298.5496178021. The cubic root of 691613712 is about 884.3439281987.

The spelling of 691613712 in words is "six hundred ninety-one million, six hundred thirteen thousand, seven hundred twelve".