28631403 has 12 divisors (see below), whose sum is σ = 41923960. Its totient is φ = 18825696.

The previous prime is 28631401. The next prime is 28631429. The reversal of 28631403 is 30413682.

It is a happy number.

28631403 is a `hidden beast` number, since 28 + 631 + 4 + 0 + 3 = 666.

It is not a de Polignac number, because 28631403 - 2¹ = 28631401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28631401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21133 + ... + 22446.

Almost surely, 2^28631403 is an apocalyptic number.

28631403 is a deficient number, since it is larger than the sum of its proper divisors (13292557).

28631403 is a wasteful number, since it uses less digits than its factorization.

28631403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43658 (or 43655 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 28631403 is about 5350.8319913823. The cubic root of 28631403 is about 305.9244655290.

The spelling of 28631403 in words is "twenty-eight million, six hundred thirty-one thousand, four hundred three".