261916072 has 16 divisors (see below), whose sum is σ = 535737600. Its totient is φ = 119052720.

The previous prime is 261916051. The next prime is 261916073. The reversal of 261916072 is 270619162.

261916072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261916073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1488072 + ... + 1488247.

It is an arithmetic number, because the mean of its divisors is an integer number (33483600).

Almost surely, 2^261916072 is an apocalyptic number.

261916072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

261916072 is an abundant number, since it is smaller than the sum of its proper divisors (273821528).

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

261916072 is a wasteful number, since it uses less digits than its factorization.

261916072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976336 (or 2976332 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 261916072 is about 16183.8213040060. The cubic root of 261916072 is about 639.8144579335.

The spelling of 261916072 in words is "two hundred sixty-one million, nine hundred sixteen thousand, seventy-two".