690649240 has 32 divisors (see below), whose sum is σ = 1635750000. Its totient is φ = 261719424.

The previous prime is 690649213. The next prime is 690649243. The reversal of 690649240 is 42946096.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 690649193 and 690649202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690649243) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 453615 + ... + 455134.

Almost surely, 2^690649240 is an apocalyptic number.

It is an amenable number.

690649240 is an abundant number, since it is smaller than the sum of its proper divisors (945100760).

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

690649240 is a wasteful number, since it uses less digits than its factorization.

690649240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908779 (or 908775 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 690649240 is about 26280.2062396778. The cubic root of 690649240 is about 883.9326573189.

The spelling of 690649240 in words is "six hundred ninety million, six hundred forty-nine thousand, two hundred forty".