234428821428 has 24 divisors (see below), whose sum is σ = 551176164000. Its totient is φ = 77546428960.

The previous prime is 234428821397. The next prime is 234428821493. The reversal of 234428821428 is 824128824432.

It is a super-2 number, since 2×234428821428² (a number of 24 digits) contains 22 as substring.

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, 74562303 + ... + 74565446.

It is an arithmetic number, because the mean of its divisors is an integer number (22965673500).

Almost surely, 2^234428821428 is an apocalyptic number.

It is an amenable number.

234428821428 is an abundant number, since it is smaller than the sum of its proper divisors (316747342572).

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

234428821428 is a wasteful number, since it uses less digits than its factorization.

234428821428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149127887 (or 149127885 counting only the distinct ones).

The product of its digits is 1572864, while the sum is 48.

The spelling of 234428821428 in words is "two hundred thirty-four billion, four hundred twenty-eight million, eight hundred twenty-one thousand, four hundred twenty-eight".