123664428 has 48 divisors (see below), whose sum is σ = 321244000. Its totient is φ = 41140224.

The previous prime is 123664403. The next prime is 123664433. The reversal of 123664428 is 824466321.

123664428 is a `hidden beast` number, since 1 + 2 + 3 + 6 + 644 + 2 + 8 = 666.

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 = 123664392 and 123664401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82308 + ... + 83796.

Almost surely, 2^123664428 is an apocalyptic number.

123664428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

123664428 is an abundant number, since it is smaller than the sum of its proper divisors (197579572).

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

123664428 is a wasteful number, since it uses less digits than its factorization.

123664428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271 (or 2263 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 123664428 is about 11120.4508901393. The cubic root of 123664428 is about 498.2128571850.

The spelling of 123664428 in words is "one hundred twenty-three million, six hundred sixty-four thousand, four hundred twenty-eight".