261281370 has 32 divisors (see below), whose sum is σ = 716658048. Its totient is φ = 59721408.

The previous prime is 261281359. The next prime is 261281401. The reversal of 261281370 is 73182162.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

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, 621889 + ... + 622308.

It is an arithmetic number, because the mean of its divisors is an integer number (22395564).

Almost surely, 2^261281370 is an apocalyptic number.

261281370 is an abundant number, since it is smaller than the sum of its proper divisors (455376678).

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

261281370 is a wasteful number, since it uses less digits than its factorization.

261281370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244214.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 261281370 is about 16164.2002585962. The cubic root of 261281370 is about 639.2972184696.

The spelling of 261281370 in words is "two hundred sixty-one million, two hundred eighty-one thousand, three hundred seventy".