28782741 has 16 divisors (see below), whose sum is σ = 41638464. Its totient is φ = 17579904.

The previous prime is 28782727. The next prime is 28782749. The reversal of 28782741 is 14728782.

It is not a de Polignac number, because 28782741 - 2⁷ = 28782613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 28782741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28782749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2650 + ... + 8036.

It is an arithmetic number, because the mean of its divisors is an integer number (2602404).

Almost surely, 2^28782741 is an apocalyptic number.

It is an amenable number.

28782741 is a deficient number, since it is larger than the sum of its proper divisors (12855723).

28782741 is a wasteful number, since it uses less digits than its factorization.

28782741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5540.

The product of its digits is 50176, while the sum is 39.

The square root of 28782741 is about 5364.9548926342. The cubic root of 28782741 is about 306.4625304699.

It can be divided in two parts, 287 and 82741, that added together give a triangular number (83028 = T₄₀₇).

The spelling of 28782741 in words is "twenty-eight million, seven hundred eighty-two thousand, seven hundred forty-one".