28311550 has 12 divisors (see below), whose sum is σ = 52659576. Its totient is φ = 11324600.

The previous prime is 28311541. The next prime is 28311553. The reversal of 28311550 is 5511382.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28311553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283066 + ... + 283165.

It is an arithmetic number, because the mean of its divisors is an integer number (4388298).

Almost surely, 2^28311550 is an apocalyptic number.

28311550 is a deficient number, since it is larger than the sum of its proper divisors (24348026).

28311550 is a wasteful number, since it uses less digits than its factorization.

28311550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566243 (or 566238 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 28311550 is about 5320.8598929120. The cubic root of 28311550 is about 304.7809948011.

The spelling of 28311550 in words is "twenty-eight million, three hundred eleven thousand, five hundred fifty".