28400767 has 2 divisors, whose sum is σ = 28400768. Its totient is φ = 28400766.

The previous prime is 28400759. The next prime is 28400777. The reversal of 28400767 is 76700482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28400767 - 2³ = 28400759 is a prime.

It is equal to p_1764808 and since 28400767 and 1764808 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28400717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200383 + 14200384.

It is an arithmetic number, because the mean of its divisors is an integer number (14200384).

Almost surely, 2^28400767 is an apocalyptic number.

28400767 is a deficient number, since it is larger than the sum of its proper divisors (1).

28400767 is an equidigital number, since it uses as much as digits as its factorization.

28400767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 28400767 is about 5329.2369997965. The cubic root of 28400767 is about 305.1008069541.

The spelling of 28400767 in words is "twenty-eight million, four hundred thousand, seven hundred sixty-seven".