7820720281 has 8 divisors (see below), whose sum is σ = 8567395200. Its totient is φ = 7079995440.

The previous prime is 7820720251. The next prime is 7820720287. The reversal of 7820720281 is 1820270287.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7820720281 - 2¹⁵ = 7820687513 is a prime.

It is a super-2 number, since 2×7820720281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7820720281.

It is not an unprimeable number, because it can be changed into a prime (7820720287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1484766 + ... + 1490023.

It is an arithmetic number, because the mean of its divisors is an integer number (1070924400).

Almost surely, 2^7820720281 is an apocalyptic number.

It is an amenable number.

7820720281 is a deficient number, since it is larger than the sum of its proper divisors (746674919).

7820720281 is a wasteful number, since it uses less digits than its factorization.

7820720281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2975039.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 7820720281 is about 88434.8363542332. The cubic root of 7820720281 is about 1984.9470114253.

The spelling of 7820720281 in words is "seven billion, eight hundred twenty million, seven hundred twenty thousand, two hundred eighty-one".