28378562457 has 8 divisors (see below), whose sum is σ = 43243523776. Its totient is φ = 16216321392.

The previous prime is 28378562449. The next prime is 28378562461. The reversal of 28378562457 is 75426587382.

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

It is not a de Polignac number, because 28378562457 - 2³ = 28378562449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28378562397 and 28378562406.

It is not an unprimeable number, because it can be changed into a prime (28378562497) 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, 675680038 + ... + 675680079.

It is an arithmetic number, because the mean of its divisors is an integer number (5405440472).

Almost surely, 2^28378562457 is an apocalyptic number.

It is an amenable number.

28378562457 is a deficient number, since it is larger than the sum of its proper divisors (14864961319).

28378562457 is a wasteful number, since it uses less digits than its factorization.

28378562457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351360127.

The product of its digits is 22579200, while the sum is 57.

The spelling of 28378562457 in words is "twenty-eight billion, three hundred seventy-eight million, five hundred sixty-two thousand, four hundred fifty-seven".