690055940 has 24 divisors (see below), whose sum is σ = 1656134592. Its totient is φ = 236590560.

The previous prime is 690055879. The next prime is 690055943. The reversal of 690055940 is 49550096.

It is a junction number, because it is equal to n+sod(n) for n = 690055894 and 690055903.

It is not an unprimeable number, because it can be changed into a prime (690055943) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2464346 + ... + 2464625.

It is an arithmetic number, because the mean of its divisors is an integer number (69005608).

Almost surely, 2^690055940 is an apocalyptic number.

It is an amenable number.

690055940 is an abundant number, since it is smaller than the sum of its proper divisors (966078652).

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

690055940 is a wasteful number, since it uses less digits than its factorization.

690055940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4928987 (or 4928985 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 690055940 is about 26268.9158512490. The cubic root of 690055940 is about 883.6794716404.

The spelling of 690055940 in words is "six hundred ninety million, fifty-five thousand, nine hundred forty".