261746772 has 24 divisors (see below), whose sum is σ = 697991616. Its totient is φ = 74784768.

The previous prime is 261746767. The next prime is 261746783. The reversal of 261746772 is 277647162.

It is a super-2 number, since 2×261746772² = 137022745304839968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

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, 1557933 + ... + 1558100.

It is an arithmetic number, because the mean of its divisors is an integer number (29082984).

Almost surely, 2^261746772 is an apocalyptic number.

It is an amenable number.

261746772 is an abundant number, since it is smaller than the sum of its proper divisors (436244844).

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

261746772 is a wasteful number, since it uses less digits than its factorization.

261746772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116047 (or 3116045 counting only the distinct ones).

The product of its digits is 197568, while the sum is 42.

The square root of 261746772 is about 16178.5899261957. The cubic root of 261746772 is about 639.6765716068.

The spelling of 261746772 in words is "two hundred sixty-one million, seven hundred forty-six thousand, seven hundred seventy-two".