261261364 has 24 divisors (see below), whose sum is σ = 562717568. Its totient is φ = 103356000.

The previous prime is 261261359. The next prime is 261261383. The reversal of 261261364 is 463162162.

It is a congruent number.

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, 358512 + ... + 359239.

Almost surely, 2^261261364 is an apocalyptic number.

It is an amenable number.

261261364 is an abundant number, since it is smaller than the sum of its proper divisors (301456204).

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

261261364 is a wasteful number, since it uses less digits than its factorization.

261261364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717775 (or 717773 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 261261364 is about 16163.5814100712. The cubic root of 261261364 is about 639.2809013137.

The spelling of 261261364 in words is "two hundred sixty-one million, two hundred sixty-one thousand, three hundred sixty-four".