61888266 has 64 divisors (see below), whose sum is σ = 153584640. Its totient is φ = 18310320.

The previous prime is 61888261. The next prime is 61888273. The reversal of 61888266 is 66288816.

61888266 is a `hidden beast` number, since 618 + 8 + 8 + 26 + 6 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61888261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24331 + ... + 26753.

It is an arithmetic number, because the mean of its divisors is an integer number (2399760).

Almost surely, 2^61888266 is an apocalyptic number.

61888266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 61888266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76792320).

61888266 is an abundant number, since it is smaller than the sum of its proper divisors (91696374).

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

61888266 is a wasteful number, since it uses less digits than its factorization.

61888266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488 (or 2482 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 61888266 is about 7866.9095583971. The cubic root of 61888266 is about 395.5512593634.

The spelling of 61888266 in words is "sixty-one million, eight hundred eighty-eight thousand, two hundred sixty-six".