7028720864 has 24 divisors (see below), whose sum is σ = 15095776248. Its totient is φ = 3194872960.

The previous prime is 7028720851. The next prime is 7028720869. The reversal of 7028720864 is 4680278207.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7028720869) 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, 9983627 + ... + 9984330.

It is an arithmetic number, because the mean of its divisors is an integer number (628990677).

Almost surely, 2^7028720864 is an apocalyptic number.

It is an amenable number.

7028720864 is an abundant number, since it is smaller than the sum of its proper divisors (8067055384).

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

7028720864 is a wasteful number, since it uses less digits than its factorization.

7028720864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19967978 (or 19967970 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 44.

The square root of 7028720864 is about 83837.4669464673. The cubic root of 7028720864 is about 1915.5438526050.

The spelling of 7028720864 in words is "seven billion, twenty-eight million, seven hundred twenty thousand, eight hundred sixty-four".