61393728 has 112 divisors (see below), whose sum is σ = 181782720. Its totient is φ = 18124800.

The previous prime is 61393727. The next prime is 61393729. The reversal of 61393728 is 82739316.

It is an interprime number because it is at equal distance from previous prime (61393727) and next prime (61393729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61393727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86238 + ... + 86946.

It is an arithmetic number, because the mean of its divisors is an integer number (1623060).

Almost surely, 2^61393728 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 61393728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90891360).

61393728 is an abundant number, since it is smaller than the sum of its proper divisors (120388992).

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

61393728 is a wasteful number, since it uses less digits than its factorization.

61393728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776 (or 766 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 61393728 is about 7835.4149858192. The cubic root of 61393728 is about 394.4948474961.

The spelling of 61393728 in words is "sixty-one million, three hundred ninety-three thousand, seven hundred twenty-eight".