28401777 has 12 divisors (see below), whose sum is σ = 41133300. Its totient is φ = 18884448.

The previous prime is 28401767. The next prime is 28401823. The reversal of 28401777 is 77710482.

It can be written as a sum of positive squares in 2 ways, for example, as 16353936 + 12047841 = 4044^2 + 3471^2 .

It is not a de Polignac number, because 28401777 - 2⁷ = 28401649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28401707) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 402 + ... + 7547.

It is an arithmetic number, because the mean of its divisors is an integer number (3427775).

Almost surely, 2^28401777 is an apocalyptic number.

It is an amenable number.

28401777 is a deficient number, since it is larger than the sum of its proper divisors (12731523).

28401777 is a wasteful number, since it uses less digits than its factorization.

28401777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8352 (or 8349 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 28401777 is about 5329.3317592359. The cubic root of 28401777 is about 305.1044236189.

The spelling of 28401777 in words is "twenty-eight million, four hundred one thousand, seven hundred seventy-seven".