7957887628393 has 4 divisors (see below), whose sum is σ = 7957945072260. Its totient is φ = 7957830184528.

The previous prime is 7957887628387. The next prime is 7957887628423. The reversal of 7957887628393 is 3938267887597.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1812114437904 + 6145773190489 = 1346148^2 + 2479067^2 .

It is a cyclic number.

It is not a de Polignac number, because 7957887628393 - 2¹³ = 7957887620201 is a prime.

It is a super-2 number, since 2×7957887628393² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7957887628343) 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, 28513630 + ... + 28791367.

It is an arithmetic number, because the mean of its divisors is an integer number (1989486268065).

Almost surely, 2^{7957887628393} is an apocalyptic number.

It is an amenable number.

7957887628393 is a deficient number, since it is larger than the sum of its proper divisors (57443867).

7957887628393 is a wasteful number, since it uses less digits than its factorization.

7957887628393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57443866.

The product of its digits is 7681443840, while the sum is 82.

The spelling of 7957887628393 in words is "seven trillion, nine hundred fifty-seven billion, eight hundred eighty-seven million, six hundred twenty-eight thousand, three hundred ninety-three".