28051551 has 18 divisors (see below), whose sum is σ = 44539040. Its totient is φ = 17000280.

The previous prime is 28051549. The next prime is 28051553. The reversal of 28051551 is 15515082.

It is an interprime number because it is at equal distance from previous prime (28051549) and next prime (28051553).

It is not a de Polignac number, because 28051551 - 2¹ = 28051549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28051553) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11791 + ... + 13968.

Almost surely, 2^28051551 is an apocalyptic number.

28051551 is a deficient number, since it is larger than the sum of its proper divisors (16487489).

28051551 is a wasteful number, since it uses less digits than its factorization.

28051551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25787 (or 25773 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 28051551 is about 5296.3714937682. The cubic root of 28051551 is about 303.8451391254.

It can be divided in two parts, 2805 and 1551, that added together give a square (4356 = 66²).

The spelling of 28051551 in words is "twenty-eight million, fifty-one thousand, five hundred fifty-one".