61620520 has 64 divisors (see below), whose sum is σ = 150433920. Its totient is φ = 22581504.

The previous prime is 61620497. The next prime is 61620539. The reversal of 61620520 is 2502616.

It is a junction number, because it is equal to n+sod(n) for n = 61620491 and 61620500.

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, 84397 + ... + 85123.

It is an arithmetic number, because the mean of its divisors is an integer number (2350530).

Almost surely, 2^61620520 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 61620520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75216960).

61620520 is an abundant number, since it is smaller than the sum of its proper divisors (88813400).

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

61620520 is a wasteful number, since it uses less digits than its factorization.

61620520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 61620520 is about 7849.8738843373. The cubic root of 61620520 is about 394.9800128753.

It can be divided in two parts, 616205 and 20, that added together give a square (616225 = 785²).

The spelling of 61620520 in words is "sixty-one million, six hundred twenty thousand, five hundred twenty".