261406788 has 24 divisors (see below), whose sum is σ = 642052320. Its totient is φ = 82549440.

The previous prime is 261406781. The next prime is 261406801. The reversal of 261406788 is 887604162.

It is not an unprimeable number, because it can be changed into a prime (261406781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 573033 + ... + 573488.

It is an arithmetic number, because the mean of its divisors is an integer number (26752180).

Almost surely, 2^261406788 is an apocalyptic number.

It is an amenable number.

261406788 is an abundant number, since it is smaller than the sum of its proper divisors (380645532).

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

261406788 is a wasteful number, since it uses less digits than its factorization.

261406788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146547 (or 1146545 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 261406788 is about 16168.0792922351. The cubic root of 261406788 is about 639.3994920620.

The spelling of 261406788 in words is "two hundred sixty-one million, four hundred six thousand, seven hundred eighty-eight".