690818040 has 144 divisors (see below), whose sum is σ = 2467974600. Its totient is φ = 167460480.

The previous prime is 690818021. The next prime is 690818057. The reversal of 690818040 is 40818096.

It is a happy number.

690818040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 690817986 and 690818004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35631 + ... + 51489.

Almost surely, 2^690818040 is an apocalyptic number.

690818040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690818040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1233987300).

690818040 is an abundant number, since it is smaller than the sum of its proper divisors (1777156560).

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

690818040 is a wasteful number, since it uses less digits than its factorization.

690818040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15898 (or 15880 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 690818040 is about 26283.4175859990. The cubic root of 690818040 is about 884.0046647720.

The spelling of 690818040 in words is "six hundred ninety million, eight hundred eighteen thousand, forty".