28428628 has 6 divisors (see below), whose sum is σ = 49750106. Its totient is φ = 14214312.

The previous prime is 28428611. The next prime is 28428637. The reversal of 28428628 is 82682482.

It can be written as a sum of positive squares in only one way, i.e., 15382084 + 13046544 = 3922^2 + 3612^2 .

It is a super-3 number, since 3×28428628³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3553575 + ... + 3553582.

Almost surely, 2^28428628 is an apocalyptic number.

It is an amenable number.

28428628 is a deficient number, since it is larger than the sum of its proper divisors (21321478).

28428628 is a wasteful number, since it uses less digits than its factorization.

28428628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107161 (or 7107159 counting only the distinct ones).

The product of its digits is 98304, while the sum is 40.

The square root of 28428628 is about 5331.8503354839. The cubic root of 28428628 is about 305.2005417661.

The spelling of 28428628 in words is "twenty-eight million, four hundred twenty-eight thousand, six hundred twenty-eight".