61772905 has 8 divisors (see below), whose sum is σ = 74176200. Its totient is φ = 49385856.

The previous prime is 61772873. The next prime is 61772959. The reversal of 61772905 is 50927716.

It can be written as a sum of positive squares in 4 ways, for example, as 15492096 + 46280809 = 3936^2 + 6803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61772905 - 2⁵ = 61772873 is a prime.

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, 7101 + ... + 13189.

It is an arithmetic number, because the mean of its divisors is an integer number (9272025).

Almost surely, 2^61772905 is an apocalyptic number.

It is an amenable number.

61772905 is a deficient number, since it is larger than the sum of its proper divisors (12403295).

61772905 is a wasteful number, since it uses less digits than its factorization.

61772905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8123.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 61772905 is about 7859.5740978758. The cubic root of 61772905 is about 395.3053346043.

The spelling of 61772905 in words is "sixty-one million, seven hundred seventy-two thousand, nine hundred five".