61720480 has 48 divisors (see below), whose sum is σ = 149222304. Its totient is φ = 24111360.

The previous prime is 61720459. The next prime is 61720501. The reversal of 61720480 is 8402716.

It is an interprime number because it is at equal distance from previous prime (61720459) and next prime (61720501).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2395 + ... + 11365.

It is an arithmetic number, because the mean of its divisors is an integer number (3108798).

Almost surely, 2^61720480 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 61720480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74611152).

61720480 is an abundant number, since it is smaller than the sum of its proper divisors (87501824).

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

61720480 is a wasteful number, since it uses less digits than its factorization.

61720480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9029 (or 9021 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 61720480 is about 7856.2382855919. The cubic root of 61720480 is about 395.1934746255.

The spelling of 61720480 in words is "sixty-one million, seven hundred twenty thousand, four hundred eighty".