28631423 has 4 divisors (see below), whose sum is σ = 30138360. Its totient is φ = 27124488.

The previous prime is 28631401. The next prime is 28631429. The reversal of 28631423 is 32413682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28631423 - 2¹² = 28627327 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 (28631429) 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, 753440 + ... + 753477.

It is an arithmetic number, because the mean of its divisors is an integer number (7534590).

Almost surely, 2^28631423 is an apocalyptic number.

28631423 is a deficient number, since it is larger than the sum of its proper divisors (1506937).

28631423 is a wasteful number, since it uses less digits than its factorization.

28631423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506936.

The product of its digits is 6912, while the sum is 29.

The square root of 28631423 is about 5350.8338602502. The cubic root of 28631423 is about 305.9245367618.

The spelling of 28631423 in words is "twenty-eight million, six hundred thirty-one thousand, four hundred twenty-three".