756921636 has 18 divisors (see below), whose sum is σ = 1913329782. Its totient is φ = 252307200.

The previous prime is 756921631. The next prime is 756921653. The reversal of 756921636 is 636129657.

756921636 is a `hidden beast` number, since 7 + 5 + 6 + 9 + 2 + 1 + 636 = 666.

756921636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 576288036 + 180633600 = 24006^2 + 13440^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 756921591 and 756921600.

It is not an unprimeable number, because it can be changed into a prime (756921631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10512765 + ... + 10512836.

It is an arithmetic number, because the mean of its divisors is an integer number (106296099).

Almost surely, 2^756921636 is an apocalyptic number.

It is an amenable number.

756921636 is an abundant number, since it is smaller than the sum of its proper divisors (1156408146).

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

756921636 is a wasteful number, since it uses less digits than its factorization.

756921636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21025611 (or 21025606 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 756921636 is about 27512.2088535254. The cubic root of 756921636 is about 911.3467303481.

The spelling of 756921636 in words is "seven hundred fifty-six million, nine hundred twenty-one thousand, six hundred thirty-six".