261478992 has 40 divisors (see below), whose sum is σ = 684749824. Its totient is φ = 85964544.

The previous prime is 261478981. The next prime is 261479021. The reversal of 261478992 is 299874162.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 33808 + ... + 40815.

Almost surely, 2^261478992 is an apocalyptic number.

It is an amenable number.

261478992 is an abundant number, since it is smaller than the sum of its proper divisors (423270832).

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

261478992 is a wasteful number, since it uses less digits than its factorization.

261478992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74707 (or 74701 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 261478992 is about 16170.3120563581. The cubic root of 261478992 is about 639.4583568314.

The spelling of 261478992 in words is "two hundred sixty-one million, four hundred seventy-eight thousand, nine hundred ninety-two".