61222864 has 40 divisors (see below), whose sum is σ = 128260640. Its totient is φ = 28211328.

The previous prime is 61222853. The next prime is 61222873. The reversal of 61222864 is 46822216.

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, 8527 + ... + 13969.

It is an arithmetic number, because the mean of its divisors is an integer number (3206516).

Almost surely, 2^61222864 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 61222864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64130320).

61222864 is an abundant number, since it is smaller than the sum of its proper divisors (67037776).

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

61222864 is a wasteful number, since it uses less digits than its factorization.

61222864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5507 (or 5501 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 61222864 is about 7824.5040737417. The cubic root of 61222864 is about 394.1285364849.

The spelling of 61222864 in words is "sixty-one million, two hundred twenty-two thousand, eight hundred sixty-four".