28078735623 has 8 divisors (see below), whose sum is σ = 37447154688. Its totient is φ = 18714736824.

The previous prime is 28078735621. The next prime is 28078735631. The reversal of 28078735623 is 32653787082.

It is a happy number.

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

It is not a de Polignac number, because 28078735623 - 2¹ = 28078735621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078735621) 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, 1090215 + ... + 1115672.

It is an arithmetic number, because the mean of its divisors is an integer number (4680894336).

Almost surely, 2^28078735623 is an apocalyptic number.

28078735623 is a deficient number, since it is larger than the sum of its proper divisors (9368419065).

28078735623 is a wasteful number, since it uses less digits than its factorization.

28078735623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2210133.

The product of its (nonzero) digits is 3386880, while the sum is 51.

It can be divided in two parts, 280787 and 35623, that added together give a triangular number (316410 = T₇₉₅).

The spelling of 28078735623 in words is "twenty-eight billion, seventy-eight million, seven hundred thirty-five thousand, six hundred twenty-three".