28742893 has 4 divisors (see below), whose sum is σ = 29992608. Its totient is φ = 27493180.

The previous prime is 28742887. The next prime is 28742941. The reversal of 28742893 is 39824782.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39824782 = 2 ⋅19912391.

It is a cyclic number.

It is not a de Polignac number, because 28742893 - 2¹³ = 28734701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28742843) 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, 624823 + ... + 624868.

It is an arithmetic number, because the mean of its divisors is an integer number (7498152).

Almost surely, 2^28742893 is an apocalyptic number.

28742893 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28742893 is a deficient number, since it is larger than the sum of its proper divisors (1249715).

28742893 is a wasteful number, since it uses less digits than its factorization.

28742893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249714.

The product of its digits is 193536, while the sum is 43.

The square root of 28742893 is about 5361.2398752527. The cubic root of 28742893 is about 306.3210387473.

The spelling of 28742893 in words is "twenty-eight million, seven hundred forty-two thousand, eight hundred ninety-three".