861697536 has 180 divisors, whose sum is σ = 2695600908. Its totient is φ = 243898368.

The previous prime is 861697517. The next prime is 861697541. The reversal of 861697536 is 635796168.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

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 17 ways as a sum of consecutive naturals, for example, 8053195 + ... + 8053301.

Almost surely, 2^861697536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861697536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1347800454).

861697536 is an abundant number, since it is smaller than the sum of its proper divisors (1833903372).

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

861697536 is an equidigital number, since it uses as much as digits as its factorization.

861697536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 119 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The square root of 861697536 is about 29354.6850775136. The cubic root of 861697536 is about 951.5938290385.

The spelling of 861697536 in words is "eight hundred sixty-one million, six hundred ninety-seven thousand, five hundred thirty-six".