690375624 has 64 divisors (see below), whose sum is σ = 1797552000. Its totient is φ = 220684800.

The previous prime is 690375619. The next prime is 690375677. The reversal of 690375624 is 426573096.

It is a Cunningham number, because it is equal to 26275²-1.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101812 + ... + 108380.

It is an arithmetic number, because the mean of its divisors is an integer number (28086750).

Almost surely, 2^690375624 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 690375624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (898776000).

690375624 is an abundant number, since it is smaller than the sum of its proper divisors (1107176376).

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

690375624 is a wasteful number, since it uses less digits than its factorization.

690375624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6758 (or 6754 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 690375624 is about 26274.9999809705. Note that the first 4 decimals coincide. The cubic root of 690375624 is about 883.8159120643.

The spelling of 690375624 in words is "six hundred ninety million, three hundred seventy-five thousand, six hundred twenty-four".