61775772 has 12 divisors (see below), whose sum is σ = 144143496. Its totient is φ = 20591920.

The previous prime is 61775767. The next prime is 61775797. The reversal of 61775772 is 27757716.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2573979 + ... + 2574002.

It is an arithmetic number, because the mean of its divisors is an integer number (12011958).

Almost surely, 2^61775772 is an apocalyptic number.

It is an amenable number.

61775772 is an abundant number, since it is smaller than the sum of its proper divisors (82367724).

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

61775772 is a wasteful number, since it uses less digits than its factorization.

61775772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5147988 (or 5147986 counting only the distinct ones).

The product of its digits is 144060, while the sum is 42.

The square root of 61775772 is about 7859.7564847774. The cubic root of 61775772 is about 395.3114501381.

The spelling of 61775772 in words is "sixty-one million, seven hundred seventy-five thousand, seven hundred seventy-two".