66998672 has 20 divisors (see below), whose sum is σ = 139795740. Its totient is φ = 30922368.

The previous prime is 66998647. The next prime is 66998707. The reversal of 66998672 is 27689966.

It can be written as a sum of positive squares in 2 ways, for example, as 22429696 + 44568976 = 4736^2 + 6676^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160847 + ... + 161262.

It is an arithmetic number, because the mean of its divisors is an integer number (6989787).

Almost surely, 2^66998672 is an apocalyptic number.

It is an amenable number.

66998672 is an abundant number, since it is smaller than the sum of its proper divisors (72797068).

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

66998672 is a wasteful number, since it uses less digits than its factorization.

66998672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322130 (or 322124 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 53.

The square root of 66998672 is about 8185.2716509594. The cubic root of 66998672 is about 406.1521265762.

The spelling of 66998672 in words is "sixty-six million, nine hundred ninety-eight thousand, six hundred seventy-two".