61398540 has 192 divisors, whose sum is σ = 224716800. Its totient is φ = 13623552.

The previous prime is 61398499. The next prime is 61398551. The reversal of 61398540 is 4589316.

61398540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 61398495 and 61398504.

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 63 ways as a sum of consecutive naturals, for example, 139641 + ... + 140079.

It is an arithmetic number, because the mean of its divisors is an integer number (1170400).

Almost surely, 2^61398540 is an apocalyptic number.

61398540 is a gapful number since it is divisible by the number (60) 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 61398540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112358400).

61398540 is an abundant number, since it is smaller than the sum of its proper divisors (163318260).

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

61398540 is a wasteful number, since it uses less digits than its factorization.

61398540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 61398540 is about 7835.7220471377. The cubic root of 61398540 is about 394.5051539757.

The spelling of 61398540 in words is "sixty-one million, three hundred ninety-eight thousand, five hundred forty".