28626428 has 6 divisors (see below), whose sum is σ = 50096256. Its totient is φ = 14313212.

The previous prime is 28626427. The next prime is 28626443. The reversal of 28626428 is 82462682.

It is a junction number, because it is equal to n+sod(n) for n = 28626391 and 28626400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28626427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3578300 + ... + 3578307.

It is an arithmetic number, because the mean of its divisors is an integer number (8349376).

Almost surely, 2^28626428 is an apocalyptic number.

It is an amenable number.

28626428 is a deficient number, since it is larger than the sum of its proper divisors (21469828).

28626428 is a wasteful number, since it uses less digits than its factorization.

28626428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7156611 (or 7156609 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The square root of 28626428 is about 5350.3670902098. The cubic root of 28626428 is about 305.9067453312.

The spelling of 28626428 in words is "twenty-eight million, six hundred twenty-six thousand, four hundred twenty-eight".