1028738781 has 36 divisors (see below), whose sum is σ = 1732446144. Its totient is φ = 586530000.

The previous prime is 1028738747. The next prime is 1028738783. The reversal of 1028738781 is 1878378201.

It is not a de Polignac number, because 1028738781 - 2⁷ = 1028738653 is a prime.

It is a super-2 number, since 2×1028738781² = 2116606959066731922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028738783) 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, 214156 + ... + 218906.

It is an arithmetic number, because the mean of its divisors is an integer number (48123504).

Almost surely, 2^1028738781 is an apocalyptic number.

It is an amenable number.

1028738781 is a deficient number, since it is larger than the sum of its proper divisors (703707363).

1028738781 is a wasteful number, since it uses less digits than its factorization.

1028738781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5262 (or 5252 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 1028738781 is about 32073.9579877507. The cubic root of 1028738781 is about 1009.4892627357.

The spelling of 1028738781 in words is "one billion, twenty-eight million, seven hundred thirty-eight thousand, seven hundred eighty-one".