1264725887 has 4 divisors (see below), whose sum is σ = 1264806696. Its totient is φ = 1264645080.

The previous prime is 1264725883. The next prime is 1264725901. The reversal of 1264725887 is 7885274621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1264725887 - 2² = 1264725883 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 (1264725881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8564 + ... + 51017.

It is an arithmetic number, because the mean of its divisors is an integer number (316201674).

Almost surely, 2^1264725887 is an apocalyptic number.

1264725887 is a deficient number, since it is larger than the sum of its proper divisors (80809).

1264725887 is an equidigital number, since it uses as much as digits as its factorization.

1264725887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80808.

The product of its digits is 1505280, while the sum is 50.

The square root of 1264725887 is about 35562.9847875569. The cubic root of 1264725887 is about 1081.4309698228.

The spelling of 1264725887 in words is "one billion, two hundred sixty-four million, seven hundred twenty-five thousand, eight hundred eighty-seven".