168618428 has 24 divisors (see below), whose sum is σ = 335905920. Its totient is φ = 73311920.

The previous prime is 168618419. The next prime is 168618433. The reversal of 168618428 is 824816861.

168618428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×168618428² = 56864348522382368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

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, 82298 + ... + 84321.

It is an arithmetic number, because the mean of its divisors is an integer number (13996080).

Almost surely, 2^168618428 is an apocalyptic number.

It is an amenable number.

168618428 is a deficient number, since it is larger than the sum of its proper divisors (167287492).

168618428 is a wasteful number, since it uses less digits than its factorization.

168618428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166657 (or 166655 counting only the distinct ones).

The product of its digits is 147456, while the sum is 44.

The square root of 168618428 is about 12985.3158606173. The cubic root of 168618428 is about 552.4610680784.

The spelling of 168618428 in words is "one hundred sixty-eight million, six hundred eighteen thousand, four hundred twenty-eight".