691328442 has 16 divisors (see below), whose sum is σ = 1580179392. Its totient is φ = 197522400.

The previous prime is 691328399. The next prime is 691328459. The reversal of 691328442 is 244823196.

It is a self number, because there is not a number n which added to its sum of digits gives 691328442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8230059 + ... + 8230142.

It is an arithmetic number, because the mean of its divisors is an integer number (98761212).

Almost surely, 2^691328442 is an apocalyptic number.

691328442 is an abundant number, since it is smaller than the sum of its proper divisors (888850950).

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

691328442 is a wasteful number, since it uses less digits than its factorization.

691328442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16460213.

The product of its digits is 82944, while the sum is 39.

The square root of 691328442 is about 26293.1253752763. The cubic root of 691328442 is about 884.2223229916. Note that the first 3 decimals are identical.

The spelling of 691328442 in words is "six hundred ninety-one million, three hundred twenty-eight thousand, four hundred forty-two".