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28402987 is a prime number
BaseRepresentation
bin110110001011…
…0010100101011
31222110000120111
41230112110223
524232343422
62452435151
7463264354
oct154262453
958400514
1028402987
111503a648
129618ab7
135b66102
143ab4d2b
152760a77
hex1b1652b

28402987 has 2 divisors, whose sum is σ = 28402988. Its totient is φ = 28402986.

The previous prime is 28402981. The next prime is 28403021. The reversal of 28402987 is 78920482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28402987 - 219 = 27878699 is a prime.

It is not a weakly prime, because it can be changed into another prime (28402981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14201493 + 14201494.

It is an arithmetic number, because the mean of its divisors is an integer number (14201494).

Almost surely, 228402987 is an apocalyptic number.

28402987 is a deficient number, since it is larger than the sum of its proper divisors (1).

28402987 is an equidigital number, since it uses as much as digits as its factorization.

28402987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28402987 is about 5329.4452807023. The cubic root of 28402987 is about 305.1087563420.

The spelling of 28402987 in words is "twenty-eight million, four hundred two thousand, nine hundred eighty-seven".