61899156 has 72 divisors (see below), whose sum is σ = 173313504. Its totient is φ = 18469440.

The previous prime is 61899151. The next prime is 61899181. The reversal of 61899156 is 65199816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61899151) 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, 25366 + ... + 27698.

It is an arithmetic number, because the mean of its divisors is an integer number (2407132).

Almost surely, 2^61899156 is an apocalyptic number.

61899156 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61899156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86656752).

61899156 is an abundant number, since it is smaller than the sum of its proper divisors (111414348).

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

61899156 is a wasteful number, since it uses less digits than its factorization.

61899156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421 (or 2416 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 61899156 is about 7867.6016675986. The cubic root of 61899156 is about 395.5744587024.

It can be divided in two parts, 6189915 and 6, that added together give a triangular number (6189921 = T₃₅₁₈).

The spelling of 61899156 in words is "sixty-one million, eight hundred ninety-nine thousand, one hundred fifty-six".