691630320 has 80 divisors (see below), whose sum is σ = 2146862592. Its totient is φ = 184193280.

The previous prime is 691630319. The next prime is 691630321. The reversal of 691630320 is 23036196.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (691630319) and next prime (691630321).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691630321) 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, 253765 + ... + 256475.

Almost surely, 2^691630320 is an apocalyptic number.

691630320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691630320 is an abundant number, since it is smaller than the sum of its proper divisors (1455232272).

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

691630320 is a wasteful number, since it uses less digits than its factorization.

691630320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3790 (or 3784 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 691630320 is about 26298.8653747647. The cubic root of 691630320 is about 884.3510068449.

The spelling of 691630320 in words is "six hundred ninety-one million, six hundred thirty thousand, three hundred twenty".