1028456775 has 36 divisors (see below), whose sum is σ = 1901515200. Its totient is φ = 530812800.

The previous prime is 1028456771. The next prime is 1028456791. The reversal of 1028456775 is 5776548201.

1028456775 is a `hidden beast` number, since 1 + 0 + 2 + 84 + 567 + 7 + 5 = 666.

It is not a de Polignac number, because 1028456775 - 2² = 1028456771 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1028456775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028456771) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 66750 + ... + 80699.

Almost surely, 2^1028456775 is an apocalyptic number.

1028456775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1028456775 is a deficient number, since it is larger than the sum of its proper divisors (873058425).

1028456775 is a wasteful number, since it uses less digits than its factorization.

1028456775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147496 (or 147488 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The square root of 1028456775 is about 32069.5615030826. The cubic root of 1028456775 is about 1009.3970112489.

The spelling of 1028456775 in words is "one billion, twenty-eight million, four hundred fifty-six thousand, seven hundred seventy-five".