61910634240 has 864 divisors, whose sum is σ = 267577914240. Its totient is φ = 12867600384.

The previous prime is 61910634193. The next prime is 61910634251. The reversal of 61910634240 is 4243601916.

61910634240 is a `hidden beast` number, since 6 + 1 + 9 + 10 + 634 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 61910634195 and 61910634204.

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, 76526956 + ... + 76527764.

It is an arithmetic number, because the mean of its divisors is an integer number (309696660).

Almost surely, 2^61910634240 is an apocalyptic number.

61910634240 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 61910634240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133788957120).

61910634240 is an abundant number, since it is smaller than the sum of its proper divisors (205667280000).

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

61910634240 is a wasteful number, since it uses less digits than its factorization.

61910634240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 61910634240 in words is "sixty-one billion, nine hundred ten million, six hundred thirty-four thousand, two hundred forty".