261228492 has 72 divisors (see below), whose sum is σ = 794393600. Its totient is φ = 70707168.

The previous prime is 261228481. The next prime is 261228509. The reversal of 261228492 is 294822162.

261228492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22492 + ... + 32067.

Almost surely, 2^261228492 is an apocalyptic number.

It is an amenable number.

261228492 is an abundant number, since it is smaller than the sum of its proper divisors (533165108).

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

261228492 is a wasteful number, since it uses less digits than its factorization.

261228492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54595 (or 54590 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 261228492 is about 16162.5645242332. The cubic root of 261228492 is about 639.2540886705.

The spelling of 261228492 in words is "two hundred sixty-one million, two hundred twenty-eight thousand, four hundred ninety-two".