166687420 has 24 divisors (see below), whose sum is σ = 350328384. Its totient is φ = 66620736.

The previous prime is 166687379. The next prime is 166687421. The reversal of 166687420 is 24786661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166687421) 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, 29677 + ... + 34843.

It is an arithmetic number, because the mean of its divisors is an integer number (14597016).

Almost surely, 2^166687420 is an apocalyptic number.

166687420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166687420 is an abundant number, since it is smaller than the sum of its proper divisors (183640964).

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

166687420 is a wasteful number, since it uses less digits than its factorization.

166687420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6789 (or 6787 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 166687420 is about 12910.7482354819. The cubic root of 166687420 is about 550.3440492000.

The spelling of 166687420 in words is "one hundred sixty-six million, six hundred eighty-seven thousand, four hundred twenty".