66890592 has 36 divisors (see below), whose sum is σ = 190220940. Its totient is φ = 22296768.

The previous prime is 66890581. The next prime is 66890599. The reversal of 66890592 is 29509866.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×66890592² = 8948702596220928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66890599) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115842 + ... + 116417.

It is an arithmetic number, because the mean of its divisors is an integer number (5283915).

Almost surely, 2^66890592 is an apocalyptic number.

It is an amenable number.

66890592 is an abundant number, since it is smaller than the sum of its proper divisors (123330348).

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

66890592 is a wasteful number, since it uses less digits than its factorization.

66890592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232275 (or 232264 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 66890592 is about 8178.6668840343. Note that the first 3 decimals coincide. The cubic root of 66890592 is about 405.9336120591.

The spelling of 66890592 in words is "sixty-six million, eight hundred ninety thousand, five hundred ninety-two".