28743156 has 36 divisors (see below), whose sum is σ = 78246532. Its totient is φ = 8843904.

The previous prime is 28743151. The next prime is 28743163. The reversal of 28743156 is 65134782.

It can be written as a sum of positive squares in 2 ways, for example, as 6502500 + 22240656 = 2550^2 + 4716^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28743156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28743151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30241 + ... + 31176.

Almost surely, 2^28743156 is an apocalyptic number.

28743156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28743156 is an abundant number, since it is smaller than the sum of its proper divisors (49503376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28743156 is a wasteful number, since it uses less digits than its factorization.

28743156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61440 (or 61435 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 28743156 is about 5361.2644031049. The cubic root of 28743156 is about 306.3219730326.

The spelling of 28743156 in words is "twenty-eight million, seven hundred forty-three thousand, one hundred fifty-six".