1267264390 has 48 divisors (see below), whose sum is σ = 2628636192. Its totient is φ = 430904448.

The previous prime is 1267264333. The next prime is 1267264391. The reversal of 1267264390 is 934627621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1267264391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1352002 + ... + 1352938.

It is an arithmetic number, because the mean of its divisors is an integer number (54763254).

Almost surely, 2^1267264390 is an apocalyptic number.

1267264390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1267264390 is an abundant number, since it is smaller than the sum of its proper divisors (1361371802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1267264390 is an equidigital number, since it uses as much as digits as its factorization.

1267264390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 1267264390 is about 35598.6571375944. The cubic root of 1267264390 is about 1082.1540200748.

The spelling of 1267264390 in words is "one billion, two hundred sixty-seven million, two hundred sixty-four thousand, three hundred ninety".