691047936 has 200 divisors, whose sum is σ = 2173629480. Its totient is φ = 217976832.

The previous prime is 691047923. The next prime is 691047941. The reversal of 691047936 is 639740196.

It is a junction number, because it is equal to n+sod(n) for n = 691047891 and 691047900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 787530 + ... + 788406.

Almost surely, 2^691047936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691047936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086814740).

691047936 is an abundant number, since it is smaller than the sum of its proper divisors (1482581544).

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

691047936 is an equidigital number, since it uses as much as digits as its factorization.

691047936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 691047936 is about 26287.7906260682. The cubic root of 691047936 is about 884.1027159639.

The spelling of 691047936 in words is "six hundred ninety-one million, forty-seven thousand, nine hundred thirty-six".