28007655 has 16 divisors (see below), whose sum is σ = 48259680. Its totient is φ = 13788288.

The previous prime is 28007647. The next prime is 28007671. The reversal of 28007655 is 55670082.

It is a happy number.

It is not a de Polignac number, because 28007655 - 2³ = 28007647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71620 + ... + 72009.

It is an arithmetic number, because the mean of its divisors is an integer number (3016230).

Almost surely, 2^28007655 is an apocalyptic number.

28007655 is a deficient number, since it is larger than the sum of its proper divisors (20252025).

28007655 is a wasteful number, since it uses less digits than its factorization.

28007655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143650.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 28007655 is about 5292.2259022079. The cubic root of 28007655 is about 303.6865673906.

The spelling of 28007655 in words is "twenty-eight million, seven thousand, six hundred fifty-five".