696561840 has 120 divisors (see below), whose sum is σ = 2519265840. Its totient is φ = 171459072.

The previous prime is 696561823. The next prime is 696561863. The reversal of 696561840 is 48165696.

696561840 is a `hidden beast` number, since 6 + 9 + 6 + 561 + 84 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 23 ways as a sum of consecutive naturals, for example, 27850 + ... + 46569.

It is an arithmetic number, because the mean of its divisors is an integer number (20993882).

Almost surely, 2^696561840 is an apocalyptic number.

696561840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

696561840 is an abundant number, since it is smaller than the sum of its proper divisors (1822704000).

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

696561840 is a wasteful number, since it uses less digits than its factorization.

696561840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74451 (or 74442 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 696561840 is about 26392.4580136068. The cubic root of 696561840 is about 886.4479218684.

The spelling of 696561840 in words is "six hundred ninety-six million, five hundred sixty-one thousand, eight hundred forty".