66728037 has 16 divisors (see below), whose sum is σ = 93329280. Its totient is φ = 42326592.

The previous prime is 66728021. The next prime is 66728063. The reversal of 66728037 is 73082766.

It is not a de Polignac number, because 66728037 - 2⁴ = 66728021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66727986 and 66728004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66728737) 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, 11139 + ... + 16047.

It is an arithmetic number, because the mean of its divisors is an integer number (5833080).

Almost surely, 2^66728037 is an apocalyptic number.

It is an amenable number.

66728037 is a deficient number, since it is larger than the sum of its proper divisors (26601243).

66728037 is a wasteful number, since it uses less digits than its factorization.

66728037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 66728037 is about 8168.7230948294. The cubic root of 66728037 is about 405.6045171332.

The spelling of 66728037 in words is "sixty-six million, seven hundred twenty-eight thousand, thirty-seven".