7825921720 has 32 divisors (see below), whose sum is σ = 17624620800. Its totient is φ = 3127471488.

The previous prime is 7825921703. The next prime is 7825921777. The reversal of 7825921720 is 271295287.

It is a super-2 number, since 2×7825921720² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 46515 + ... + 133474.

It is an arithmetic number, because the mean of its divisors is an integer number (550769400).

Almost surely, 2^7825921720 is an apocalyptic number.

It is an amenable number.

7825921720 is an abundant number, since it is smaller than the sum of its proper divisors (9798699080).

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

7825921720 is a wasteful number, since it uses less digits than its factorization.

7825921720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181087 (or 181083 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 7825921720 is about 88464.2397808290. The cubic root of 7825921720 is about 1985.3869663300.

The spelling of 7825921720 in words is "seven billion, eight hundred twenty-five million, nine hundred twenty-one thousand, seven hundred twenty".