66890570 has 16 divisors (see below), whose sum is σ = 121213800. Its totient is φ = 26576064.

The previous prime is 66890539. The next prime is 66890573. The reversal of 66890570 is 7509866.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41357761 + 25532809 = 6431^2 + 5053^2 .

It is not an unprimeable number, because it can be changed into a prime (66890573) 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, 20957 + ... + 23936.

Almost surely, 2^66890570 is an apocalyptic number.

66890570 is a deficient number, since it is larger than the sum of its proper divisors (54323230).

66890570 is a wasteful number, since it uses less digits than its factorization.

66890570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45049.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 66890570 is about 8178.6655390718. The cubic root of 66890570 is about 405.9335675559.

The spelling of 66890570 in words is "sixty-six million, eight hundred ninety thousand, five hundred seventy".