61031616 has 56 divisors (see below), whose sum is σ = 165439344. Its totient is φ = 19845120.

The previous prime is 61031609. The next prime is 61031617. The reversal of 61031616 is 61613016.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (61031617) 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, 3996 + ... + 11748.

It is an arithmetic number, because the mean of its divisors is an integer number (2954274).

Almost surely, 2^61031616 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 61031616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82719672).

61031616 is an abundant number, since it is smaller than the sum of its proper divisors (104407728).

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

61031616 is a wasteful number, since it uses less digits than its factorization.

61031616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7809 (or 7799 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 61031616 is about 7812.2734207144. The cubic root of 61031616 is about 393.7177154684.

The spelling of 61031616 in words is "sixty-one million, thirty-one thousand, six hundred sixteen".