261772616 has 32 divisors (see below), whose sum is σ = 570456000. Its totient is φ = 110285376.

The previous prime is 261772607. The next prime is 261772631. The reversal of 261772616 is 616277162.

261772616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261772616.

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, 36311 + ... + 42918.

It is an arithmetic number, because the mean of its divisors is an integer number (17826750).

Almost surely, 2^261772616 is an apocalyptic number.

It is an amenable number.

261772616 is an abundant number, since it is smaller than the sum of its proper divisors (308683384).

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

261772616 is a wasteful number, since it uses less digits than its factorization.

261772616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79301 (or 79297 counting only the distinct ones).

The product of its digits is 42336, while the sum is 38.

The square root of 261772616 is about 16179.3886163847. The cubic root of 261772616 is about 639.6976240883.

The spelling of 261772616 in words is "two hundred sixty-one million, seven hundred seventy-two thousand, six hundred sixteen".