28222551 has 24 divisors (see below), whose sum is σ = 46760064. Its totient is φ = 16068240.

The previous prime is 28222549. The next prime is 28222559. The reversal of 28222551 is 15522282.

It is not a de Polignac number, because 28222551 - 2¹ = 28222549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28222559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21216 + ... + 22506.

It is an arithmetic number, because the mean of its divisors is an integer number (1948336).

Almost surely, 2^28222551 is an apocalyptic number.

28222551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28222551 is a deficient number, since it is larger than the sum of its proper divisors (18537513).

28222551 is a wasteful number, since it uses less digits than its factorization.

28222551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651 (or 1648 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 28222551 is about 5312.4900941084. The cubic root of 28222551 is about 304.4612939874.

The spelling of 28222551 in words is "twenty-eight million, two hundred twenty-two thousand, five hundred fifty-one".