28307655 has 12 divisors (see below), whose sum is σ = 49066680. Its totient is φ = 15097392.

The previous prime is 28307651. The next prime is 28307689. The reversal of 28307655 is 55670382.

It is not a de Polignac number, because 28307655 - 2² = 28307651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28307651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314485 + ... + 314574.

It is an arithmetic number, because the mean of its divisors is an integer number (4088890).

Almost surely, 2^28307655 is an apocalyptic number.

28307655 is a deficient number, since it is larger than the sum of its proper divisors (20759025).

28307655 is a wasteful number, since it uses less digits than its factorization.

28307655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629070 (or 629067 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 28307655 is about 5320.4938680540. The cubic root of 28307655 is about 304.7670172734.

The spelling of 28307655 in words is "twenty-eight million, three hundred seven thousand, six hundred fifty-five".