1306664772 has 36 divisors (see below), whose sum is σ = 3546663120. Its totient is φ = 373332624.

The previous prime is 1306664771. The next prime is 1306664783. The reversal of 1306664772 is 2774666031.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1306664771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1110522 + ... + 1111697.

It is an arithmetic number, because the mean of its divisors is an integer number (98518420).

Almost surely, 2^1306664772 is an apocalyptic number.

1306664772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1306664772 is an abundant number, since it is smaller than the sum of its proper divisors (2239998348).

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

1306664772 is a wasteful number, since it uses less digits than its factorization.

1306664772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222240 (or 2222231 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 42.

The square root of 1306664772 is about 36147.8183574057. The cubic root of 1306664772 is about 1093.2548034597.

The spelling of 1306664772 in words is "one billion, three hundred six million, six hundred sixty-four thousand, seven hundred seventy-two".