28781463 has 8 divisors (see below), whose sum is σ = 38401776. Its totient is φ = 19174400.

The previous prime is 28781453. The next prime is 28781471. The reversal of 28781463 is 36418782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28781463 - 2⁹ = 28780951 is a prime.

It is a super-2 number, since 2×28781463² = 1656745224840738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28781453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4183 + ... + 8663.

It is an arithmetic number, because the mean of its divisors is an integer number (4800222).

Almost surely, 2^28781463 is an apocalyptic number.

28781463 is a deficient number, since it is larger than the sum of its proper divisors (9620313).

28781463 is a wasteful number, since it uses less digits than its factorization.

28781463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6625.

The product of its digits is 64512, while the sum is 39.

The square root of 28781463 is about 5364.8357849985. The cubic root of 28781463 is about 306.4579945930.

The spelling of 28781463 in words is "twenty-eight million, seven hundred eighty-one thousand, four hundred sixty-three".