691920672 has 96 divisors (see below), whose sum is σ = 1931029632. Its totient is φ = 216182784.

The previous prime is 691920667. The next prime is 691920703. The reversal of 691920672 is 276029196.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477453 + ... + 478899.

It is an arithmetic number, because the mean of its divisors is an integer number (20114892).

Almost surely, 2^691920672 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 691920672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965514816).

691920672 is an abundant number, since it is smaller than the sum of its proper divisors (1239108960).

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

691920672 is a wasteful number, since it uses less digits than its factorization.

691920672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770 (or 1762 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 691920672 is about 26304.3850336783. The cubic root of 691920672 is about 884.4747420990.

The spelling of 691920672 in words is "six hundred ninety-one million, nine hundred twenty thousand, six hundred seventy-two".