66888190 has 16 divisors (see below), whose sum is σ = 121267440. Its totient is φ = 26562240.

The previous prime is 66888169. The next prime is 66888197. The reversal of 66888190 is 9188866.

It is a super-2 number, since 2×66888190² = 8948059922952200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66888190.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66888197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22671 + ... + 25450.

It is an arithmetic number, because the mean of its divisors is an integer number (7579215).

Almost surely, 2^66888190 is an apocalyptic number.

66888190 is a deficient number, since it is larger than the sum of its proper divisors (54379250).

66888190 is a wasteful number, since it uses less digits than its factorization.

66888190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48267.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 66888190 is about 8178.5200372684. The cubic root of 66888190 is about 405.9287530589.

It can be divided in two parts, 6688 and 8190, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 66888190 in words is "sixty-six million, eight hundred eighty-eight thousand, one hundred ninety".