261015408 has 60 divisors (see below), whose sum is σ = 762250320. Its totient is φ = 83221248.

The previous prime is 261015379. The next prime is 261015413. The reversal of 261015408 is 804510162.

261015408 is a `hidden beast` number, since 2 + 610 + 1 + 5 + 40 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36093 + ... + 42716.

It is an arithmetic number, because the mean of its divisors is an integer number (12704172).

Almost surely, 2^261015408 is an apocalyptic number.

It is an amenable number.

261015408 is an abundant number, since it is smaller than the sum of its proper divisors (501234912).

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

261015408 is a wasteful number, since it uses less digits than its factorization.

261015408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78846 (or 78837 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 261015408 is about 16155.9712799943. The cubic root of 261015408 is about 639.0802282686.

The spelling of 261015408 in words is "two hundred sixty-one million, fifteen thousand, four hundred eight".