61323520 has 72 divisors (see below), whose sum is σ = 153349056. Its totient is φ = 23451648.

The previous prime is 61323517. The next prime is 61323523. The reversal of 61323520 is 2532316.

It is an interprime number because it is at equal distance from previous prime (61323517) and next prime (61323523).

It is a junction number, because it is equal to n+sod(n) for n = 61323491 and 61323500.

It is not an unprimeable number, because it can be changed into a prime (61323523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28399 + ... + 30481.

It is an arithmetic number, because the mean of its divisors is an integer number (2129848).

Almost surely, 2^61323520 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 61323520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76674528).

61323520 is an abundant number, since it is smaller than the sum of its proper divisors (92025536).

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

61323520 is a wasteful number, since it uses less digits than its factorization.

61323520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127 (or 2113 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 61323520 is about 7830.9335331109. The cubic root of 61323520 is about 394.3444127010.

Adding to 61323520 its reverse (2532316), we get a palindrome (63855836).

The spelling of 61323520 in words is "sixty-one million, three hundred twenty-three thousand, five hundred twenty".