61172850 has 48 divisors (see below), whose sum is σ = 154954368. Its totient is φ = 15963840.

The previous prime is 61172849. The next prime is 61172879. The reversal of 61172850 is 5827116.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2712 + ... + 11388.

It is an arithmetic number, because the mean of its divisors is an integer number (3228216).

Almost surely, 2^61172850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61172850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77477184).

61172850 is an abundant number, since it is smaller than the sum of its proper divisors (93781518).

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

61172850 is a wasteful number, since it uses less digits than its factorization.

61172850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8739 (or 8734 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 61172850 is about 7821.3074354612. The cubic root of 61172850 is about 394.0211838095.

Adding to 61172850 its reverse (5827116), we get a palindrome (66999966).

The spelling of 61172850 in words is "sixty-one million, one hundred seventy-two thousand, eight hundred fifty".