261773772 has 24 divisors (see below), whose sum is σ = 657790896. Its totient is φ = 80545728.

The previous prime is 261773767. The next prime is 261773777. The reversal of 261773772 is 277377162.

It is an interprime number because it is at equal distance from previous prime (261773767) and next prime (261773777).

It is not an unprimeable number, because it can be changed into a prime (261773777) 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, 838863 + ... + 839174.

It is an arithmetic number, because the mean of its divisors is an integer number (27407954).

Almost surely, 2^261773772 is an apocalyptic number.

It is an amenable number.

261773772 is an abundant number, since it is smaller than the sum of its proper divisors (396017124).

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

261773772 is a wasteful number, since it uses less digits than its factorization.

261773772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678057 (or 1678055 counting only the distinct ones).

The product of its digits is 172872, while the sum is 42.

The square root of 261773772 is about 16179.4243408102. The cubic root of 261773772 is about 639.6985657317.

The spelling of 261773772 in words is "two hundred sixty-one million, seven hundred seventy-three thousand, seven hundred seventy-two".