61280737980 has 288 divisors, whose sum is σ = 217698485760. Its totient is φ = 12606528000.

The previous prime is 61280737951. The next prime is 61280737997. The reversal of 61280737980 is 8973708216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5126851 + ... + 5138789.

It is an arithmetic number, because the mean of its divisors is an integer number (755897520).

Almost surely, 2^61280737980 is an apocalyptic number.

61280737980 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 61280737980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108849242880).

61280737980 is an abundant number, since it is smaller than the sum of its proper divisors (156417747780).

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

61280737980 is a wasteful number, since it uses less digits than its factorization.

61280737980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12081 (or 12068 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 51.

The spelling of 61280737980 in words is "sixty-one billion, two hundred eighty million, seven hundred thirty-seven thousand, nine hundred eighty".