166540428 has 24 divisors (see below), whose sum is σ = 431771760. Its totient is φ = 55513440.

The previous prime is 166540403. The next prime is 166540489. The reversal of 166540428 is 824045661.

166540428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 166540392 and 166540401.

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, 770913 + ... + 771128.

It is an arithmetic number, because the mean of its divisors is an integer number (17990490).

Almost surely, 2^166540428 is an apocalyptic number.

166540428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

166540428 is an abundant number, since it is smaller than the sum of its proper divisors (265231332).

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

166540428 is a wasteful number, since it uses less digits than its factorization.

166540428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542054 (or 1542046 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 166540428 is about 12905.0543586612. The cubic root of 166540428 is about 550.1822294231.

The spelling of 166540428 in words is "one hundred sixty-six million, five hundred forty thousand, four hundred twenty-eight".