61888428 has 96 divisors (see below), whose sum is σ = 186117120. Its totient is φ = 17418240.

The previous prime is 61888399. The next prime is 61888433. The reversal of 61888428 is 82488816.

It is a happy number.

61888428 is a `hidden beast` number, since 618 + 8 + 8 + 4 + 28 = 666.

It is a super-2 number, since 2×61888428² = 7660355040622368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53100 + ... + 54252.

It is an arithmetic number, because the mean of its divisors is an integer number (1938720).

Almost surely, 2^61888428 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 61888428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93058560).

61888428 is an abundant number, since it is smaller than the sum of its proper divisors (124228692).

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

61888428 is a wasteful number, since it uses less digits than its factorization.

61888428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244 (or 1236 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The square root of 61888428 is about 7866.9198546826. The cubic root of 61888428 is about 395.5516044975.

The spelling of 61888428 in words is "sixty-one million, eight hundred eighty-eight thousand, four hundred twenty-eight".