61508720 has 240 divisors, whose sum is σ = 192362688. Its totient is φ = 18063360.

The previous prime is 61508677. The next prime is 61508723. The reversal of 61508720 is 2780516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61508723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 866285 + ... + 866355.

Almost surely, 2^61508720 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 61508720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96181344).

61508720 is an abundant number, since it is smaller than the sum of its proper divisors (130853968).

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

61508720 is a wasteful number, since it uses less digits than its factorization.

61508720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 61508720 is about 7842.7495178668. The cubic root of 61508720 is about 394.7409934784.

The spelling of 61508720 in words is "sixty-one million, five hundred eight thousand, seven hundred twenty".