261870490 has 32 divisors (see below), whose sum is σ = 540307584. Its totient is φ = 89517120.

The previous prime is 261870487. The next prime is 261870527. The reversal of 261870490 is 94078162.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18900 + ... + 29680.

It is an arithmetic number, because the mean of its divisors is an integer number (16884612).

Almost surely, 2^261870490 is an apocalyptic number.

261870490 is an abundant number, since it is smaller than the sum of its proper divisors (278437094).

261870490 is a wasteful number, since it uses less digits than its factorization.

261870490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11142.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 261870490 is about 16182.4129844718. The cubic root of 261870490 is about 639.7773395360. Note that the first 3 decimals are identical.

The spelling of 261870490 in words is "two hundred sixty-one million, eight hundred seventy thousand, four hundred ninety".