261637896 has 32 divisors (see below), whose sum is σ = 704410560. Its totient is φ = 80503872.

The previous prime is 261637889. The next prime is 261637921. The reversal of 261637896 is 698736162.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418980 + ... + 419603.

It is an arithmetic number, because the mean of its divisors is an integer number (22012830).

Almost surely, 2^261637896 is an apocalyptic number.

261637896 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

261637896 is an abundant number, since it is smaller than the sum of its proper divisors (442772664).

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

261637896 is a wasteful number, since it uses less digits than its factorization.

261637896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838605 (or 838601 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The square root of 261637896 is about 16175.2247588712. The cubic root of 261637896 is about 639.5878661701.

The spelling of 261637896 in words is "two hundred sixty-one million, six hundred thirty-seven thousand, eight hundred ninety-six".