61722228 has 24 divisors (see below), whose sum is σ = 144627840. Its totient is φ = 20487040.

The previous prime is 61722187. The next prime is 61722251. The reversal of 61722228 is 82222716.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 61722195 and 61722204.

It is a congruent number.

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, 7893 + ... + 13628.

It is an arithmetic number, because the mean of its divisors is an integer number (6026160).

Almost surely, 2^61722228 is an apocalyptic number.

It is an amenable number.

61722228 is an abundant number, since it is smaller than the sum of its proper divisors (82905612).

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

61722228 is a wasteful number, since it uses less digits than its factorization.

61722228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21767 (or 21765 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 61722228 is about 7856.3495339757. The cubic root of 61722228 is about 395.1972053789.

The spelling of 61722228 in words is "sixty-one million, seven hundred twenty-two thousand, two hundred twenty-eight".