684425290 has 12 divisors (see below), whose sum is σ = 1232114454. Its totient is φ = 273737024.

The previous prime is 684425267. The next prime is 684425309. The reversal of 684425290 is 92524486.

It can be written as a sum of positive squares in 3 ways, for example, as 660130249 + 24295041 = 25693^2 + 4929^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78594 + ... + 86866.

Almost surely, 2^684425290 is an apocalyptic number.

684425290 is a deficient number, since it is larger than the sum of its proper divisors (547689164).

684425290 is an frugal number, since it uses more digits than its factorization.

684425290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16553 (or 8280 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 684425290 is about 26161.5230825730. The cubic root of 684425290 is about 881.2693844805.

Multiplying 684425290 by its sum of digits (40), we get a square (27377011600 = 165460²).

The spelling of 684425290 in words is "six hundred eighty-four million, four hundred twenty-five thousand, two hundred ninety".