689692644 has 45 divisors (see below), whose sum is σ = 1804229427. Its totient is φ = 229739976.

The previous prime is 689692639. The next prime is 689692649. The reversal of 689692644 is 446296986.

The square root of 689692644 is 26262.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (689692639) and next prime (689692649).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (689692649) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 471987 + ... + 473445.

Almost surely, 2^689692644 is an apocalyptic number.

689692644 is the 26262-nd square number.

It is an amenable number.

689692644 is an abundant number, since it is smaller than the sum of its proper divisors (1114536783).

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

689692644 is an equidigital number, since it uses as much as digits as its factorization.

689692644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2934 (or 1464 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The cubic root of 689692644 is about 883.5243665470.

The spelling of 689692644 in words is "six hundred eighty-nine million, six hundred ninety-two thousand, six hundred forty-four".