10028156985 has 144 divisors (see below), whose sum is σ = 22771487232. Its totient is φ = 4032806400.

The previous prime is 10028156959. The next prime is 10028156987. The reversal of 10028156985 is 58965182001.

It is a happy number.

10028156985 is a `hidden beast` number, since 1 + 0 + 0 + 2 + 8 + 1 + 569 + 85 = 666.

It is not a de Polignac number, because 10028156985 - 2⁶ = 10028156921 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 10028156985.

It is not an unprimeable number, because it can be changed into a prime (10028156987) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 745237 + ... + 758573.

It is an arithmetic number, because the mean of its divisors is an integer number (158135328).

Almost surely, 2^10028156985 is an apocalyptic number.

10028156985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10028156985 is an abundant number, since it is smaller than the sum of its proper divisors (12743330247).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10028156985 is a wasteful number, since it uses less digits than its factorization.

10028156985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13404 (or 13394 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 10028156985 in words is "ten billion, twenty-eight million, one hundred fifty-six thousand, nine hundred eighty-five".