66072390 has 16 divisors (see below), whose sum is σ = 158573808. Its totient is φ = 17619296.

The previous prime is 66072371. The next prime is 66072401. The reversal of 66072390 is 9327066.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1101177 + ... + 1101236.

It is an arithmetic number, because the mean of its divisors is an integer number (9910863).

Almost surely, 2^66072390 is an apocalyptic number.

66072390 is an abundant number, since it is smaller than the sum of its proper divisors (92501418).

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

66072390 is a wasteful number, since it uses less digits than its factorization.

66072390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202423.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 66072390 is about 8128.4924801589. The cubic root of 66072390 is about 404.2716982611.

The spelling of 66072390 in words is "sixty-six million, seventy-two thousand, three hundred ninety".