61807716 has 72 divisors (see below), whose sum is σ = 172658304. Its totient is φ = 18543360.

The previous prime is 61807673. The next prime is 61807717. The reversal of 61807716 is 61770816.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (61807717) 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, 11881 + ... + 16271.

It is an arithmetic number, because the mean of its divisors is an integer number (2398032).

Almost surely, 2^61807716 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 61807716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86329152).

61807716 is an abundant number, since it is smaller than the sum of its proper divisors (110850588).

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

61807716 is a wasteful number, since it uses less digits than its factorization.

61807716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441 (or 4436 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 61807716 is about 7861.7883461716. The cubic root of 61807716 is about 395.3795763769.

The spelling of 61807716 in words is "sixty-one million, eight hundred seven thousand, seven hundred sixteen".