166678628 has 6 divisors (see below), whose sum is σ = 291687606. Its totient is φ = 83339312.

The previous prime is 166678627. The next prime is 166678639. The reversal of 166678628 is 826876661.

It is a happy number.

166678628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 144192064 + 22486564 = 12008^2 + 4742^2 .

It is not an unprimeable number, because it can be changed into a prime (166678627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20834825 + ... + 20834832.

It is an arithmetic number, because the mean of its divisors is an integer number (48614601).

Almost surely, 2^166678628 is an apocalyptic number.

It is an amenable number.

166678628 is a deficient number, since it is larger than the sum of its proper divisors (125008978).

166678628 is a wasteful number, since it uses less digits than its factorization.

166678628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41669661 (or 41669659 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 166678628 is about 12910.4077394945. The cubic root of 166678628 is about 550.3343729850.

The spelling of 166678628 in words is "one hundred sixty-six million, six hundred seventy-eight thousand, six hundred twenty-eight".