61488840 has 128 divisors (see below), whose sum is σ = 213995520. Its totient is φ = 13843200.

The previous prime is 61488829. The next prime is 61488859. The reversal of 61488840 is 4888416.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59125 + ... + 60155.

It is an arithmetic number, because the mean of its divisors is an integer number (1671840).

Almost surely, 2^61488840 is an apocalyptic number.

61488840 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 61488840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106997760).

61488840 is an abundant number, since it is smaller than the sum of its proper divisors (152506680).

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

61488840 is a wasteful number, since it uses less digits than its factorization.

61488840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 61488840 is about 7841.4820027849. The cubic root of 61488840 is about 394.6984613163.

The spelling of 61488840 in words is "sixty-one million, four hundred eighty-eight thousand, eight hundred forty".