61722920 has 64 divisors (see below), whose sum is σ = 168065280. Its totient is φ = 19915776.

The previous prime is 61722901. The next prime is 61722949. The reversal of 61722920 is 2922716.

61722920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1724 + ... + 11243.

It is an arithmetic number, because the mean of its divisors is an integer number (2626020).

Almost surely, 2^61722920 is an apocalyptic number.

It is an amenable number.

61722920 is an abundant number, since it is smaller than the sum of its proper divisors (106342360).

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

61722920 is a wasteful number, since it uses less digits than its factorization.

61722920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13002 (or 12998 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 61722920 is about 7856.3935746626. The cubic root of 61722920 is about 395.1986822938.

The spelling of 61722920 in words is "sixty-one million, seven hundred twenty-two thousand, nine hundred twenty".