690555840 has 112 divisors (see below), whose sum is σ = 2361212448. Its totient is φ = 169979904.

The previous prime is 690555829. The next prime is 690555881. The reversal of 690555840 is 48555096.

It is a junction number, because it is equal to n+sod(n) for n = 690555792 and 690555801.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15187 + ... + 40146.

It is an arithmetic number, because the mean of its divisors is an integer number (21082254).

Almost surely, 2^690555840 is an apocalyptic number.

690555840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

690555840 is an abundant number, since it is smaller than the sum of its proper divisors (1670656608).

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

690555840 is a wasteful number, since it uses less digits than its factorization.

690555840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55366 (or 55356 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 690555840 is about 26278.4291767982. The cubic root of 690555840 is about 883.8928092902.

The spelling of 690555840 in words is "six hundred ninety million, five hundred fifty-five thousand, eight hundred forty".