61668612 has 72 divisors (see below), whose sum is σ = 165110400. Its totient is φ = 19367040.

The previous prime is 61668599. The next prime is 61668613. The reversal of 61668612 is 21686616.

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 (61668613) 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, 58264 + ... + 59312.

It is an arithmetic number, because the mean of its divisors is an integer number (2293200).

Almost surely, 2^61668612 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 61668612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82555200).

61668612 is an abundant number, since it is smaller than the sum of its proper divisors (103441788).

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

61668612 is a wasteful number, since it uses less digits than its factorization.

61668612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153 (or 1148 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 61668612 is about 7852.9365208182. The cubic root of 61668612 is about 395.0827407721.

The spelling of 61668612 in words is "sixty-one million, six hundred sixty-eight thousand, six hundred twelve".