690615994 has 8 divisors (see below), whose sum is σ = 1036595700. Its totient is φ = 345084096.

The previous prime is 690615977. The next prime is 690616019. The reversal of 690615994 is 499516096.

It can be written as a sum of positive squares in 2 ways, for example, as 653466969 + 37149025 = 25563^2 + 6095^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108069 + ... + 114280.

Almost surely, 2^690615994 is an apocalyptic number.

690615994 is a deficient number, since it is larger than the sum of its proper divisors (345979706).

690615994 is a wasteful number, since it uses less digits than its factorization.

690615994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223904.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 690615994 is about 26279.5737027829. The cubic root of 690615994 is about 883.9184737097.

The spelling of 690615994 in words is "six hundred ninety million, six hundred fifteen thousand, nine hundred ninety-four".