66828587 has 8 divisors (see below), whose sum is σ = 77234400. Its totient is φ = 56637504.

The previous prime is 66828583. The next prime is 66828589. The reversal of 66828587 is 78582866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66828587 - 2² = 66828583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66828583) 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, 53012 + ... + 54257.

It is an arithmetic number, because the mean of its divisors is an integer number (9654300).

Almost surely, 2^66828587 is an apocalyptic number.

66828587 is a deficient number, since it is larger than the sum of its proper divisors (10405813).

66828587 is a wasteful number, since it uses less digits than its factorization.

66828587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107365.

The product of its digits is 1290240, while the sum is 50.

The square root of 66828587 is about 8174.8753507317. The cubic root of 66828587 is about 405.8081450139.

The spelling of 66828587 in words is "sixty-six million, eight hundred twenty-eight thousand, five hundred eighty-seven".