1028499887961 has 224 divisors, whose sum is σ = 1976381836800. Its totient is φ = 520512998400.

The previous prime is 1028499887951. The next prime is 1028499887977. The reversal of 1028499887961 is 1697889948201.

1028499887961 is a `hidden beast` number, since 1 + 0 + 2 + 8 + 499 + 8 + 8 + 79 + 61 = 666.

It is not a de Polignac number, because 1028499887961 - 2⁵ = 1028499887929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1028499887961.

It is not an unprimeable number, because it can be changed into a prime (1028499887951) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 165910740 + ... + 165916938.

It is an arithmetic number, because the mean of its divisors is an integer number (8823133200).

Almost surely, 2^{1028499887961} is an apocalyptic number.

It is an amenable number.

1028499887961 is a deficient number, since it is larger than the sum of its proper divisors (947881948839).

1028499887961 is an equidigital number, since it uses as much as digits as its factorization.

1028499887961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6339 (or 6324 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 72.

The spelling of 1028499887961 in words is "one trillion, twenty-eight billion, four hundred ninety-nine million, eight hundred eighty-seven thousand, nine hundred sixty-one".