66690072 has 24 divisors (see below), whose sum is σ = 180619140. Its totient is φ = 22230000.

The previous prime is 66690047. The next prime is 66690073. The reversal of 66690072 is 27009666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66690073) 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, 463054 + ... + 463197.

Almost surely, 2^66690072 is an apocalyptic number.

It is an amenable number.

66690072 is an abundant number, since it is smaller than the sum of its proper divisors (113929068).

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

66690072 is a wasteful number, since it uses less digits than its factorization.

66690072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926263 (or 926256 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 66690072 is about 8166.3989615987. The cubic root of 66690072 is about 405.5275794745.

The spelling of 66690072 in words is "sixty-six million, six hundred ninety thousand, seventy-two".