261299696 has 40 divisors (see below), whose sum is σ = 590914560. Its totient is φ = 109600704.

The previous prime is 261299693. The next prime is 261299767. The reversal of 261299696 is 696992162.

It is a super-2 number, since 2×261299696² = 136555062259384832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261299693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19556 + ... + 30083.

It is an arithmetic number, because the mean of its divisors is an integer number (14772864).

Almost surely, 2^261299696 is an apocalyptic number.

It is an amenable number.

261299696 is an abundant number, since it is smaller than the sum of its proper divisors (329614864).

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

261299696 is a wasteful number, since it uses less digits than its factorization.

261299696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49701 (or 49695 counting only the distinct ones).

The product of its digits is 629856, while the sum is 50.

The square root of 261299696 is about 16164.7671186442. The cubic root of 261299696 is about 639.3121646647.

The spelling of 261299696 in words is "two hundred sixty-one million, two hundred ninety-nine thousand, six hundred ninety-six".