1027781265 has 16 divisors (see below), whose sum is σ = 1879371648. Its totient is φ = 469842816.

The previous prime is 1027781263. The next prime is 1027781297. The reversal of 1027781265 is 5621877201.

It is not a de Polignac number, because 1027781265 - 2¹ = 1027781263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1027781263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4894092 + ... + 4894301.

It is an arithmetic number, because the mean of its divisors is an integer number (117460728).

Almost surely, 2^1027781265 is an apocalyptic number.

1027781265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1027781265 is a deficient number, since it is larger than the sum of its proper divisors (851590383).

1027781265 is an equidigital number, since it uses as much as digits as its factorization.

1027781265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9788408.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 1027781265 is about 32059.0278236880. The cubic root of 1027781265 is about 1009.1759657849.

The spelling of 1027781265 in words is "one billion, twenty-seven million, seven hundred eighty-one thousand, two hundred sixty-five".