61863228 has 72 divisors (see below), whose sum is σ = 184504320. Its totient is φ = 17102880.

The previous prime is 61863203. The next prime is 61863247. The reversal of 61863228 is 82236816.

61863228 is a `hidden beast` number, since 6 + 18 + 632 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 61863192 and 61863201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3853 + ... + 11771.

It is an arithmetic number, because the mean of its divisors is an integer number (2562560).

Almost surely, 2^61863228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61863228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92252160).

61863228 is an abundant number, since it is smaller than the sum of its proper divisors (122641092).

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

61863228 is a wasteful number, since it uses less digits than its factorization.

61863228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7967 (or 7962 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 61863228 is about 7865.3180482419. The cubic root of 61863228 is about 395.4979097332.

The spelling of 61863228 in words is "sixty-one million, eight hundred sixty-three thousand, two hundred twenty-eight".