861020356 has 36 divisors (see below), whose sum is σ = 1754612076. Its totient is φ = 368625600.

The previous prime is 861020317. The next prime is 861020357. The reversal of 861020356 is 653020168.

It can be written as a sum of positive squares in 2 ways, for example, as 203918400 + 657101956 = 14280^2 + 25634^2 .

It is not an unprimeable number, because it can be changed into a prime (861020357) 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 11 ways as a sum of consecutive naturals, for example, 269086 + ... + 272266.

Almost surely, 2^861020356 is an apocalyptic number.

It is an amenable number.

861020356 is an abundant number, since it is smaller than the sum of its proper divisors (893591720).

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

861020356 is a wasteful number, since it uses less digits than its factorization.

861020356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4580 (or 4571 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 861020356 is about 29343.1483655043. The cubic root of 861020356 is about 951.3444881889.

The spelling of 861020356 in words is "eight hundred sixty-one million, twenty thousand, three hundred fifty-six".