28508078 has 16 divisors (see below), whose sum is σ = 43409520. Its totient is φ = 14040000.

The previous prime is 28508059. The next prime is 28508083. The reversal of 28508078 is 87080582.

It is a super-2 number, since 2×28508078² = 1625421022508168, which 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, 54458 + ... + 54978.

It is an arithmetic number, because the mean of its divisors is an integer number (2713095).

Almost surely, 2^28508078 is an apocalyptic number.

28508078 is a deficient number, since it is larger than the sum of its proper divisors (14901442).

28508078 is a wasteful number, since it uses less digits than its factorization.

28508078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883.

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 28508078 is about 5339.2956464313. The cubic root of 28508078 is about 305.4845938034.

The spelling of 28508078 in words is "twenty-eight million, five hundred eight thousand, seventy-eight".