1028772739 has 4 divisors (see below), whose sum is σ = 1044127624. Its totient is φ = 1013417856.

The previous prime is 1028772733. The next prime is 1028772749. The reversal of 1028772739 is 9372778201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9372778201 = 139 ⋅67430059.

It is a cyclic number.

It is not a de Polignac number, because 1028772739 - 2¹³ = 1028764547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028772733) 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, 7677342 + ... + 7677475.

It is an arithmetic number, because the mean of its divisors is an integer number (261031906).

Almost surely, 2^1028772739 is an apocalyptic number.

1028772739 is a deficient number, since it is larger than the sum of its proper divisors (15354885).

1028772739 is an equidigital number, since it uses as much as digits as its factorization.

1028772739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15354884.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 1028772739 is about 32074.4873536585. The cubic root of 1028772739 is about 1009.5003701421.

The spelling of 1028772739 in words is "one billion, twenty-eight million, seven hundred seventy-two thousand, seven hundred thirty-nine".