61787130 has 64 divisors (see below), whose sum is σ = 153128448. Its totient is φ = 15946560.

The previous prime is 61787071. The next prime is 61787153. The reversal of 61787130 is 3178716.

It is a junction number, because it is equal to n+sod(n) for n = 61787091 and 61787100.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 272077 + ... + 272303.

It is an arithmetic number, because the mean of its divisors is an integer number (2392632).

Almost surely, 2^61787130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61787130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76564224).

61787130 is an abundant number, since it is smaller than the sum of its proper divisors (91341318).

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

61787130 is a wasteful number, since it uses less digits than its factorization.

61787130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 61787130 is about 7860.4789930385. The cubic root of 61787130 is about 395.3356757752.

The spelling of 61787130 in words is "sixty-one million, seven hundred eighty-seven thousand, one hundred thirty".