28783137 has 4 divisors (see below), whose sum is σ = 38377520. Its totient is φ = 19188756.

The previous prime is 28783123. The next prime is 28783141. The reversal of 28783137 is 73138782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28783137 - 2⁴ = 28783121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28783095 and 28783104.

It is not an unprimeable number, because it can be changed into a prime (28783037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4797187 + ... + 4797192.

It is an arithmetic number, because the mean of its divisors is an integer number (9594380).

Almost surely, 2^28783137 is an apocalyptic number.

It is an amenable number.

28783137 is a deficient number, since it is larger than the sum of its proper divisors (9594383).

28783137 is an equidigital number, since it uses as much as digits as its factorization.

28783137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9594382.

The product of its digits is 56448, while the sum is 39.

The square root of 28783137 is about 5364.9917986890. The cubic root of 28783137 is about 306.4639359256.

It can be divided in two parts, 28783 and 137, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28783137 in words is "twenty-eight million, seven hundred eighty-three thousand, one hundred thirty-seven".