28956737 has 4 divisors (see below), whose sum is σ = 29033520. Its totient is φ = 28879956.

The previous prime is 28956727. The next prime is 28956743. The reversal of 28956737 is 73765982.

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: 73765982 = 2 ⋅36882991.

It is a cyclic number.

It is not a de Polignac number, because 28956737 - 2⁴ = 28956721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28956691 and 28956700.

It is not an unprimeable number, because it can be changed into a prime (28956727) 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, 37823 + ... + 38580.

It is an arithmetic number, because the mean of its divisors is an integer number (7258380).

Almost surely, 2^28956737 is an apocalyptic number.

It is an amenable number.

28956737 is a deficient number, since it is larger than the sum of its proper divisors (76783).

28956737 is an equidigital number, since it uses as much as digits as its factorization.

28956737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76782.

The product of its digits is 635040, while the sum is 47.

The square root of 28956737 is about 5381.1464391893. The cubic root of 28956737 is about 307.0788276325.

The spelling of 28956737 in words is "twenty-eight million, nine hundred fifty-six thousand, seven hundred thirty-seven".