61880994840 has 256 divisors, whose sum is σ = 230717030400. Its totient is φ = 12952313856.

The previous prime is 61880994811. The next prime is 61880994881. The reversal of 61880994840 is 4849908816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 469801 + ... + 586919.

It is an arithmetic number, because the mean of its divisors is an integer number (901238400).

Almost surely, 2^61880994840 is an apocalyptic number.

61880994840 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 61880994840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115358515200).

61880994840 is an abundant number, since it is smaller than the sum of its proper divisors (168836035560).

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

61880994840 is a wasteful number, since it uses less digits than its factorization.

61880994840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117194 (or 117190 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 57.

The spelling of 61880994840 in words is "sixty-one billion, eight hundred eighty million, nine hundred ninety-four thousand, eight hundred forty".