28371551 has 6 divisors (see below), whose sum is σ = 30722040. Its totient is φ = 26188968.

The previous prime is 28371533. The next prime is 28371557. The reversal of 28371551 is 15517382.

It is not a de Polignac number, because 28371551 - 2¹⁸ = 28109407 is a prime.

It is a super-2 number, since 2×28371551² = 1609889812291202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28371557) 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, 83771 + ... + 84108.

It is an arithmetic number, because the mean of its divisors is an integer number (5120340).

Almost surely, 2^28371551 is an apocalyptic number.

28371551 is a deficient number, since it is larger than the sum of its proper divisors (2350489).

28371551 is a wasteful number, since it uses less digits than its factorization.

28371551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167905 (or 167892 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 28371551 is about 5326.4951891464. The cubic root of 28371551 is about 304.9961515236.

The spelling of 28371551 in words is "twenty-eight million, three hundred seventy-one thousand, five hundred fifty-one".