61715880 has 96 divisors (see below), whose sum is σ = 201670560. Its totient is φ = 16368000.

The previous prime is 61715873. The next prime is 61715887. The reversal of 61715880 is 8851716.

61715880 is a `hidden beast` number, since 6 + 1 + 71 + 588 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (61715873) and next prime (61715887).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61715887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90019 + ... + 90701.

It is an arithmetic number, because the mean of its divisors is an integer number (2100735).

Almost surely, 2^61715880 is an apocalyptic number.

61715880 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 61715880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100835280).

61715880 is an abundant number, since it is smaller than the sum of its proper divisors (139954680).

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

61715880 is a wasteful number, since it uses less digits than its factorization.

61715880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951 (or 944 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 61715880 is about 7855.9455191594. The cubic root of 61715880 is about 395.1836565168.

The spelling of 61715880 in words is "sixty-one million, seven hundred fifteen thousand, eight hundred eighty".