1249820064 has 48 divisors (see below), whose sum is σ = 3645311040. Its totient is φ = 416606400.

The previous prime is 1249820063. The next prime is 1249820101. The reversal of 1249820064 is 4600289421.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1249820063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 722412 + ... + 724139.

It is an arithmetic number, because the mean of its divisors is an integer number (75943980).

Almost surely, 2^1249820064 is an apocalyptic number.

It is an amenable number.

1249820064 is an abundant number, since it is smaller than the sum of its proper divisors (2395490976).

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

1249820064 is a wasteful number, since it uses less digits than its factorization.

1249820064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446570 (or 1446556 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1249820064 is about 35352.7942884293. The cubic root of 1249820064 is about 1077.1656544875.

The spelling of 1249820064 in words is "one billion, two hundred forty-nine million, eight hundred twenty thousand, sixty-four".