261693788 has 12 divisors (see below), whose sum is σ = 464414832. Its totient is φ = 129003840.

The previous prime is 261693781. The next prime is 261693797. The reversal of 261693788 is 887396162.

261693788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261693781) 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, 460445 + ... + 461012.

It is an arithmetic number, because the mean of its divisors is an integer number (38701236).

Almost surely, 2^261693788 is an apocalyptic number.

It is an amenable number.

261693788 is a deficient number, since it is larger than the sum of its proper divisors (202721044).

261693788 is a wasteful number, since it uses less digits than its factorization.

261693788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921532 (or 921530 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

The square root of 261693788 is about 16176.9523705796. The cubic root of 261693788 is about 639.6334065910.

The spelling of 261693788 in words is "two hundred sixty-one million, six hundred ninety-three thousand, seven hundred eighty-eight".