28378965573 has 48 divisors (see below), whose sum is σ = 50711160960. Its totient is φ = 15363012096.

The previous prime is 28378965547. The next prime is 28378965577. The reversal of 28378965573 is 37556987382.

28378965573 is a `hidden beast` number, since 2 + 8 + 3 + 78 + 9 + 6 + 557 + 3 = 666.

It is not a de Polignac number, because 28378965573 - 2¹⁴ = 28378949189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 28378965573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28378965577) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139740 + ... + 276197.

It is an arithmetic number, because the mean of its divisors is an integer number (1056482520).

Almost surely, 2^28378965573 is an apocalyptic number.

It is an amenable number.

28378965573 is a deficient number, since it is larger than the sum of its proper divisors (22332195387).

28378965573 is a wasteful number, since it uses less digits than its factorization.

28378965573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415991 (or 415966 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 63.

The spelling of 28378965573 in words is "twenty-eight billion, three hundred seventy-eight million, nine hundred sixty-five thousand, five hundred seventy-three".