61619320 has 96 divisors (see below), whose sum is σ = 164440800. Its totient is φ = 20355840.

The previous prime is 61619317. The next prime is 61619321. The reversal of 61619320 is 2391616.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61619321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268966 + ... + 269194.

It is an arithmetic number, because the mean of its divisors is an integer number (1712925).

Almost surely, 2^61619320 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 61619320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82220400).

61619320 is an abundant number, since it is smaller than the sum of its proper divisors (102821480).

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

61619320 is a wasteful number, since it uses less digits than its factorization.

61619320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 61619320 is about 7849.7974496161. The cubic root of 61619320 is about 394.9774489075.

The spelling of 61619320 in words is "sixty-one million, six hundred nineteen thousand, three hundred twenty".