1264563990 has 24 divisors (see below), whose sum is σ = 3287866608. Its totient is φ = 337217040.

The previous prime is 1264563983. The next prime is 1264564027. The reversal of 1264563990 is 993654621.

1264563990 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 5 + 639 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7025266 + ... + 7025445.

It is an arithmetic number, because the mean of its divisors is an integer number (136994442).

Almost surely, 2^1264563990 is an apocalyptic number.

1264563990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1264563990 is an abundant number, since it is smaller than the sum of its proper divisors (2023302618).

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

1264563990 is a wasteful number, since it uses less digits than its factorization.

1264563990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14050724 (or 14050721 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 1264563990 is about 35560.7085137515. The cubic root of 1264563990 is about 1081.3848233541.

The spelling of 1264563990 in words is "one billion, two hundred sixty-four million, five hundred sixty-three thousand, nine hundred ninety".