61799920 has 120 divisors (see below), whose sum is σ = 178086816. Its totient is φ = 19528704.

The previous prime is 61799917. The next prime is 61799939. The reversal of 61799920 is 2999716.

It is a super-2 number, since 2×61799920² = 7638460224012800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94314 + ... + 94966.

Almost surely, 2^61799920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61799920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89043408).

61799920 is an abundant number, since it is smaller than the sum of its proper divisors (116286896).

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

61799920 is a wasteful number, since it uses less digits than its factorization.

61799920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699 (or 680 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 61799920 is about 7861.2925145933. The cubic root of 61799920 is about 395.3629521915.

The spelling of 61799920 in words is "sixty-one million, seven hundred ninety-nine thousand, nine hundred twenty".