61407320 has 64 divisors (see below), whose sum is σ = 149688000. Its totient is φ = 22537728.

The previous prime is 61407317. The next prime is 61407329. The reversal of 61407320 is 2370416.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61407329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139661 + ... + 140099.

It is an arithmetic number, because the mean of its divisors is an integer number (2338875).

Almost surely, 2^61407320 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 61407320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74844000).

61407320 is an abundant number, since it is smaller than the sum of its proper divisors (88280680).

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

61407320 is a wasteful number, since it uses less digits than its factorization.

61407320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 61407320 is about 7836.2822817966. The cubic root of 61407320 is about 394.5239578438.

Adding to 61407320 its reverse (2370416), we get a palindrome (63777736).

The spelling of 61407320 in words is "sixty-one million, four hundred seven thousand, three hundred twenty".