691373740 has 24 divisors (see below), whose sum is σ = 1460284560. Its totient is φ = 274949568.

The previous prime is 691373723. The next prime is 691373743. The reversal of 691373740 is 47373196.

It is a junction number, because it is equal to n+sod(n) for n = 691373693 and 691373702.

It is not an unprimeable number, because it can be changed into a prime (691373743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96450 + ... + 103369.

It is an arithmetic number, because the mean of its divisors is an integer number (60845190).

Almost surely, 2^691373740 is an apocalyptic number.

It is an amenable number.

691373740 is an abundant number, since it is smaller than the sum of its proper divisors (768910820).

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

691373740 is a wasteful number, since it uses less digits than its factorization.

691373740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200001 (or 199999 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 40.

The square root of 691373740 is about 26293.9867650381. The cubic root of 691373740 is about 884.2416349065.

The spelling of 691373740 in words is "six hundred ninety-one million, three hundred seventy-three thousand, seven hundred forty".