261147408 has 20 divisors (see below), whose sum is σ = 674630928. Its totient is φ = 87049120.

The previous prime is 261147389. The next prime is 261147427. The reversal of 261147408 is 804741162.

It is an interprime number because it is at equal distance from previous prime (261147389) and next prime (261147427).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2720238 + ... + 2720333.

Almost surely, 2^261147408 is an apocalyptic number.

It is an amenable number.

261147408 is an abundant number, since it is smaller than the sum of its proper divisors (413483520).

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

261147408 is a wasteful number, since it uses less digits than its factorization.

261147408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440582 (or 5440576 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 261147408 is about 16160.0559404972. The cubic root of 261147408 is about 639.1879414163.

The spelling of 261147408 in words is "two hundred sixty-one million, one hundred forty-seven thousand, four hundred eight".