28463940 has 48 divisors (see below), whose sum is σ = 88556160. Its totient is φ = 7590240.

The previous prime is 28463887. The next prime is 28463959. The reversal of 28463940 is 4936482.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28463895 and 28463904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25816 + ... + 26895.

It is an arithmetic number, because the mean of its divisors is an integer number (1844920).

Almost surely, 2^28463940 is an apocalyptic number.

28463940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28463940 is an abundant number, since it is smaller than the sum of its proper divisors (60092220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28463940 is a wasteful number, since it uses less digits than its factorization.

28463940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52729 (or 52721 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 28463940 is about 5335.1607286004. The cubic root of 28463940 is about 305.3268555459.

It can be divided in two parts, 28463 and 940, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 28463940 in words is "twenty-eight million, four hundred sixty-three thousand, nine hundred forty".