61399536 has 80 divisors (see below), whose sum is σ = 174869760. Its totient is φ = 18408960.

The previous prime is 61399517. The next prime is 61399549. The reversal of 61399536 is 63599316.

61399536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53820 + ... + 54948.

It is an arithmetic number, because the mean of its divisors is an integer number (2185872).

Almost surely, 2^61399536 is an apocalyptic number.

61399536 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61399536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87434880).

61399536 is an abundant number, since it is smaller than the sum of its proper divisors (113470224).

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

61399536 is a wasteful number, since it uses less digits than its factorization.

61399536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1248 counting only the distinct ones).

The product of its digits is 131220, while the sum is 42.

The square root of 61399536 is about 7835.7856019674. The cubic root of 61399536 is about 394.5072871698.

The spelling of 61399536 in words is "sixty-one million, three hundred ninety-nine thousand, five hundred thirty-six".