28863770 has 16 divisors (see below), whose sum is σ = 55951560. Its totient is φ = 10657344.

The previous prime is 28863763. The next prime is 28863799. The reversal of 28863770 is 7736882.

It can be written as a sum of positive squares in 4 ways, for example, as 9740641 + 19123129 = 3121^2 + 4373^2 .

It is a super-2 number, since 2×28863770² = 1666234437225800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 110885 + ... + 111144.

Almost surely, 2^28863770 is an apocalyptic number.

28863770 is a deficient number, since it is larger than the sum of its proper divisors (27087790).

28863770 is a wasteful number, since it uses less digits than its factorization.

28863770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222049.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 28863770 is about 5372.5012796648. The cubic root of 28863770 is about 306.7498448496.

The spelling of 28863770 in words is "twenty-eight million, eight hundred sixty-three thousand, seven hundred seventy".