61722855 has 12 divisors (see below), whose sum is σ = 106986360. Its totient is φ = 32918832.

The previous prime is 61722833. The next prime is 61722863. The reversal of 61722855 is 55822716.

It is a happy number.

It is not a de Polignac number, because 61722855 - 2¹² = 61718759 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 685765 + ... + 685854.

It is an arithmetic number, because the mean of its divisors is an integer number (8915530).

Almost surely, 2^61722855 is an apocalyptic number.

61722855 is a deficient number, since it is larger than the sum of its proper divisors (45263505).

61722855 is a wasteful number, since it uses less digits than its factorization.

61722855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371630 (or 1371627 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 61722855 is about 7856.3894379034. The cubic root of 61722855 is about 395.1985435668.

The spelling of 61722855 in words is "sixty-one million, seven hundred twenty-two thousand, eight hundred fifty-five".