1264027649 has 4 divisors (see below), whose sum is σ = 1330555440. Its totient is φ = 1197499860.

The previous prime is 1264027637. The next prime is 1264027691. The reversal of 1264027649 is 9467204621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9467204621 = 7 ⋅1352457803.

It is a cyclic number.

It is not a de Polignac number, because 1264027649 - 2²⁰ = 1262979073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264027619) 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, 33263867 + ... + 33263904.

It is an arithmetic number, because the mean of its divisors is an integer number (332638860).

Almost surely, 2^1264027649 is an apocalyptic number.

1264027649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1264027649 is a deficient number, since it is larger than the sum of its proper divisors (66527791).

1264027649 is an equidigital number, since it uses as much as digits as its factorization.

1264027649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66527790.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 1264027649 is about 35553.1665115781. The cubic root of 1264027649 is about 1081.2319187327.

The spelling of 1264027649 in words is "one billion, two hundred sixty-four million, twenty-seven thousand, six hundred forty-nine".