861556480 has 36 divisors (see below), whose sum is σ = 2063700072. Its totient is φ = 344622080.

The previous prime is 861556459. The next prime is 861556523. The reversal of 861556480 is 84655168.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335266 + ... + 337825.

It is an arithmetic number, because the mean of its divisors is an integer number (57325002).

Almost surely, 2^861556480 is an apocalyptic number.

861556480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

861556480 is an abundant number, since it is smaller than the sum of its proper divisors (1202143592).

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

861556480 is an equidigital number, since it uses as much as digits as its factorization.

861556480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673112 (or 673098 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 861556480 is about 29352.2823644091. The cubic root of 861556480 is about 951.5419023325.

The spelling of 861556480 in words is "eight hundred sixty-one million, five hundred fifty-six thousand, four hundred eighty".