261412280 has 32 divisors (see below), whose sum is σ = 589127040. Its totient is φ = 104396160.

The previous prime is 261412259. The next prime is 261412309. The reversal of 261412280 is 82214162.

It is a happy number.

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, 21497 + ... + 31383.

It is an arithmetic number, because the mean of its divisors is an integer number (18410220).

Almost surely, 2^261412280 is an apocalyptic number.

261412280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261412280 is an abundant number, since it is smaller than the sum of its proper divisors (327714760).

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

261412280 is a wasteful number, since it uses less digits than its factorization.

261412280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10559 (or 10555 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 261412280 is about 16168.2491321726. The cubic root of 261412280 is about 639.4039698307.

The spelling of 261412280 in words is "two hundred sixty-one million, four hundred twelve thousand, two hundred eighty".