690470644 has 24 divisors (see below), whose sum is σ = 1249522848. Its totient is φ = 333659040.

The previous prime is 690470639. The next prime is 690470681. The reversal of 690470644 is 446074096.

It is a junction number, because it is equal to n+sod(n) for n = 690470597 and 690470606.

It is a congruent number.

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, 10102 + ... + 38509.

It is an arithmetic number, because the mean of its divisors is an integer number (52063452).

Almost surely, 2^690470644 is an apocalyptic number.

It is an amenable number.

690470644 is a deficient number, since it is larger than the sum of its proper divisors (559052204).

690470644 is a wasteful number, since it uses less digits than its factorization.

690470644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48735 (or 48733 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 690470644 is about 26276.8081014418. The cubic root of 690470644 is about 883.8564582696.

The spelling of 690470644 in words is "six hundred ninety million, four hundred seventy thousand, six hundred forty-four".