61920330 has 64 divisors (see below), whose sum is σ = 154828800. Its totient is φ = 15831360.

The previous prime is 61920319. The next prime is 61920343. The reversal of 61920330 is 3302916.

It is a self number, because there is not a number n which added to its sum of digits gives 61920330.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129031 + ... + 129509.

It is an arithmetic number, because the mean of its divisors is an integer number (2419200).

Almost surely, 2^61920330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61920330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77414400).

61920330 is an abundant number, since it is smaller than the sum of its proper divisors (92908470).

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

61920330 is a wasteful number, since it uses less digits than its factorization.

61920330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 61920330 is about 7868.9471976879. The cubic root of 61920330 is about 395.6195586103.

The spelling of 61920330 in words is "sixty-one million, nine hundred twenty thousand, three hundred thirty".