28502906 has 4 divisors (see below), whose sum is σ = 42754362. Its totient is φ = 14251452.

The previous prime is 28502893. The next prime is 28502933. The reversal of 28502906 is 60920582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60920582 = 2 ⋅30460291.

It can be written as a sum of positive squares in only one way, i.e., 21077281 + 7425625 = 4591^2 + 2725^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7125725 + ... + 7125728.

Almost surely, 2^28502906 is an apocalyptic number.

28502906 is a deficient number, since it is larger than the sum of its proper divisors (14251456).

28502906 is a wasteful number, since it uses less digits than its factorization.

28502906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14251455.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28502906 is about 5338.8112909149. The cubic root of 28502906 is about 305.4661187841.

The spelling of 28502906 in words is "twenty-eight million, five hundred two thousand, nine hundred six".