31428562387 has 4 divisors (see below), whose sum is σ = 31435368256. Its totient is φ = 31421756520.

The previous prime is 31428562369. The next prime is 31428562427. The reversal of 31428562387 is 78326582413.

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

It is a cyclic number.

It is not a de Polignac number, because 31428562387 - 2²³ = 31420173779 is a prime.

It is a super-2 number, since 2×31428562387² (a number of 22 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 31428562387.

It is not an unprimeable number, because it can be changed into a prime (31428562327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3396003 + ... + 3405244.

It is an arithmetic number, because the mean of its divisors is an integer number (7858842064).

Almost surely, 2^31428562387 is an apocalyptic number.

31428562387 is a deficient number, since it is larger than the sum of its proper divisors (6805869).

31428562387 is an equidigital number, since it uses as much as digits as its factorization.

31428562387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6805868.

The product of its digits is 1935360, while the sum is 49.

The spelling of 31428562387 in words is "thirty-one billion, four hundred twenty-eight million, five hundred sixty-two thousand, three hundred eighty-seven".