61218793920 has 112 divisors (see below), whose sum is σ = 194458315680. Its totient is φ = 16317566976.

The previous prime is 61218793873. The next prime is 61218793967. The reversal of 61218793920 is 2939781216.

It is an interprime number because it is at equal distance from previous prime (61218793873) and next prime (61218793967).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 61218793920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2280094 + ... + 2306786.

Almost surely, 2^61218793920 is an apocalyptic number.

61218793920 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 61218793920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97229157840).

61218793920 is an abundant number, since it is smaller than the sum of its proper divisors (133239521760).

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

61218793920 is a wasteful number, since it uses less digits than its factorization.

61218793920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29102 (or 29092 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The spelling of 61218793920 in words is "sixty-one billion, two hundred eighteen million, seven hundred ninety-three thousand, nine hundred twenty".