261951788 has 24 divisors (see below), whose sum is σ = 536684064. Its totient is φ = 109526400.

The previous prime is 261951779. The next prime is 261951791. The reversal of 261951788 is 887159162.

261951788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 112943 + ... + 115238.

It is an arithmetic number, because the mean of its divisors is an integer number (22361836).

Almost surely, 2^261951788 is an apocalyptic number.

261951788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

261951788 is an abundant number, since it is smaller than the sum of its proper divisors (274732276).

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

261951788 is a wasteful number, since it uses less digits than its factorization.

261951788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228233 (or 228231 counting only the distinct ones).

The product of its digits is 241920, while the sum is 47.

The square root of 261951788 is about 16184.9247140665. The cubic root of 261951788 is about 639.8435392271.

The spelling of 261951788 in words is "two hundred sixty-one million, nine hundred fifty-one thousand, seven hundred eighty-eight".