28012551 has 32 divisors (see below), whose sum is σ = 45342720. Its totient is φ = 15036384.

The previous prime is 28012547. The next prime is 28012559. The reversal of 28012551 is 15521082.

It is not a de Polignac number, because 28012551 - 2² = 28012547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28012559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28006 + ... + 28988.

It is an arithmetic number, because the mean of its divisors is an integer number (1416960).

Almost surely, 2^28012551 is an apocalyptic number.

28012551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28012551 is a deficient number, since it is larger than the sum of its proper divisors (17330169).

28012551 is a wasteful number, since it uses less digits than its factorization.

28012551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 28012551 is about 5292.6884472827. The cubic root of 28012551 is about 303.7042621102.

The spelling of 28012551 in words is "twenty-eight million, twelve thousand, five hundred fifty-one".