690505426 has 16 divisors (see below), whose sum is σ = 1117935000. Its totient is φ = 317979648.

The previous prime is 690505423. The next prime is 690505427. The reversal of 690505426 is 624505096.

It can be written as a sum of positive squares in 4 ways, for example, as 668274201 + 22231225 = 25851^2 + 4715^2 .

It is not an unprimeable number, because it can be changed into a prime (690505423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17901 + ... + 41248.

Almost surely, 2^690505426 is an apocalyptic number.

690505426 is a deficient number, since it is larger than the sum of its proper divisors (427429574).

690505426 is a wasteful number, since it uses less digits than its factorization.

690505426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59613.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 690505426 is about 26277.4699314831. The cubic root of 690505426 is about 883.8712992477.

The spelling of 690505426 in words is "six hundred ninety million, five hundred five thousand, four hundred twenty-six".