1028677861 has 4 divisors (see below), whose sum is σ = 1050564672. Its totient is φ = 1006791052.

The previous prime is 1028677817. The next prime is 1028677883. The reversal of 1028677861 is 1687768201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1028677861 - 2¹³ = 1028669669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028677801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10943335 + ... + 10943428.

It is an arithmetic number, because the mean of its divisors is an integer number (262641168).

Almost surely, 2^1028677861 is an apocalyptic number.

It is an amenable number.

1028677861 is a deficient number, since it is larger than the sum of its proper divisors (21886811).

1028677861 is an equidigital number, since it uses as much as digits as its factorization.

1028677861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21886810.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 1028677861 is about 32073.0082935792. The cubic root of 1028677861 is about 1009.4693356492.

The spelling of 1028677861 in words is "one billion, twenty-eight million, six hundred seventy-seven thousand, eight hundred sixty-one".