1028693457 has 12 divisors (see below), whose sum is σ = 1620971664. Its totient is φ = 623450520.

The previous prime is 1028693453. The next prime is 1028693531. The reversal of 1028693457 is 7543968201.

1028693457 is a `hidden beast` number, since 102 + 8 + 6 + 93 + 457 = 666.

1028693457 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1028693457 - 2² = 1028693453 is a prime.

It is a super-2 number, since 2×1028693457² = 2116420456949221698, which contains 22 as substring.

1028693457 is strictly pandigital in base 10.

It is not an unprimeable number, because it can be changed into a prime (1028693453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5195323 + ... + 5195520.

It is an arithmetic number, because the mean of its divisors is an integer number (135080972).

It is a 2-persistent number, because it is pandigital, and so is 2⋅1028693457 = 2057386914, but 3⋅1028693457 = 3086080371 is not.

Almost surely, 2^1028693457 is an apocalyptic number.

It is an amenable number.

1028693457 is a deficient number, since it is larger than the sum of its proper divisors (592278207).

1028693457 is a wasteful number, since it uses less digits than its factorization.

1028693457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10390860 (or 10390857 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 1028693457 is about 32073.2514254480. The cubic root of 1028693457 is about 1009.4744372153.

The spelling of 1028693457 in words is "one billion, twenty-eight million, six hundred ninety-three thousand, four hundred fifty-seven".