691879374 has 32 divisors (see below), whose sum is σ = 1573271040. Its totient is φ = 225262296.

The previous prime is 691879373. The next prime is 691879381. The reversal of 691879374 is 473978196.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 691879374.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691879373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146662 + ... + 151305.

It is an arithmetic number, because the mean of its divisors is an integer number (49164720).

Almost surely, 2^691879374 is an apocalyptic number.

691879374 is an abundant number, since it is smaller than the sum of its proper divisors (881391666).

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

691879374 is a wasteful number, since it uses less digits than its factorization.

691879374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298021 (or 298015 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 691879374 is about 26303.6000197692. The cubic root of 691879374 is about 884.4571448193.

The spelling of 691879374 in words is "six hundred ninety-one million, eight hundred seventy-nine thousand, three hundred seventy-four".