7858272721 has 16 divisors (see below), whose sum is σ = 8493343488. Its totient is φ = 7227633600.

The previous prime is 7858272689. The next prime is 7858272731. The reversal of 7858272721 is 1272728587.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7858272721 - 2⁵ = 7858272689 is a prime.

It is a super-2 number, since 2×7858272721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7858272731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7621476 + ... + 7622506.

It is an arithmetic number, because the mean of its divisors is an integer number (530833968).

Almost surely, 2^7858272721 is an apocalyptic number.

It is an amenable number.

7858272721 is a deficient number, since it is larger than the sum of its proper divisors (635070767).

7858272721 is a wasteful number, since it uses less digits than its factorization.

7858272721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592.

The product of its digits is 878080, while the sum is 49.

The square root of 7858272721 is about 88646.8991053833. The cubic root of 7858272721 is about 1988.1189535442.

The spelling of 7858272721 in words is "seven billion, eight hundred fifty-eight million, two hundred seventy-two thousand, seven hundred twenty-one".