61646780 has 48 divisors (see below), whose sum is σ = 142841664. Its totient is φ = 22202880.

The previous prime is 61646771. The next prime is 61646797. The reversal of 61646780 is 8764616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7769 + ... + 13551.

It is an arithmetic number, because the mean of its divisors is an integer number (2975868).

Almost surely, 2^61646780 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 61646780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71420832).

61646780 is an abundant number, since it is smaller than the sum of its proper divisors (81194884).

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

61646780 is a wasteful number, since it uses less digits than its factorization.

61646780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5846 (or 5844 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 61646780 is about 7851.5463445107. The cubic root of 61646780 is about 395.0361127054.

It can be divided in two parts, 61646 and 780, that added together give a palindrome (62426).

The spelling of 61646780 in words is "sixty-one million, six hundred forty-six thousand, seven hundred eighty".