261051960 has 64 divisors (see below), whose sum is σ = 843403680. Its totient is φ = 64258560.

The previous prime is 261051919. The next prime is 261052003. The reversal of 261051960 is 69150162.

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

It is a congruent 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, 82111 + ... + 85230.

Almost surely, 2^261051960 is an apocalyptic number.

261051960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261051960 is an abundant number, since it is smaller than the sum of its proper divisors (582351720).

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

261051960 is a wasteful number, since it uses less digits than its factorization.

261051960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167368 (or 167364 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 261051960 is about 16157.1024630037. The cubic root of 261051960 is about 639.1100586534.

The spelling of 261051960 in words is "two hundred sixty-one million, fifty-one thousand, nine hundred sixty".