66900090 has 32 divisors (see below), whose sum is σ = 161557056. Its totient is φ = 17729280.

The previous prime is 66900089. The next prime is 66900091. The reversal of 66900090 is 9000966.

It is an interprime number because it is at equal distance from previous prime (66900089) and next prime (66900091).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66900091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1951 + ... + 11730.

It is an arithmetic number, because the mean of its divisors is an integer number (5048658).

Almost surely, 2^66900090 is an apocalyptic number.

66900090 is an abundant number, since it is smaller than the sum of its proper divisors (94656966).

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

66900090 is a wasteful number, since it uses less digits than its factorization.

66900090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13854.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 66900090 is about 8179.2475204019. The cubic root of 66900090 is about 405.9528244020.

It can be divided in two parts, 6 and 6900090, that added together give a palindrome (6900096).

The spelling of 66900090 in words is "sixty-six million, nine hundred thousand, ninety".