61811320 has 48 divisors (see below), whose sum is σ = 147765240. Its totient is φ = 23265792.

The previous prime is 61811317. The next prime is 61811333. The reversal of 61811320 is 2311816.

It is a junction number, because it is equal to n+sod(n) for n = 61811291 and 61811300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8887 + ... + 14233.

Almost surely, 2^61811320 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 61811320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73882620).

61811320 is an abundant number, since it is smaller than the sum of its proper divisors (85953920).

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

61811320 is a wasteful number, since it uses less digits than its factorization.

61811320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5392 (or 5371 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 61811320 is about 7862.0175527660. The cubic root of 61811320 is about 395.3872610717.

The spelling of 61811320 in words is "sixty-one million, eight hundred eleven thousand, three hundred twenty".