28623020513 has 18 divisors (see below), whose sum is σ = 31176078066. Its totient is φ = 26187588864.

The previous prime is 28623020507. The next prime is 28623020521. The reversal of 28623020513 is 31502032682.

It can be written as a sum of positive squares in 9 ways, for example, as 5365855504 + 23257165009 = 73252^2 + 152503^2 .

It is not a de Polignac number, because 28623020513 - 2¹² = 28623016417 is a prime.

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 28623020513.

It is not an unprimeable number, because it can be changed into a prime (28623020593) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25809203 + ... + 25810311.

It is an arithmetic number, because the mean of its divisors is an integer number (1732004337).

Almost surely, 2^28623020513 is an apocalyptic number.

It is an amenable number.

28623020513 is a deficient number, since it is larger than the sum of its proper divisors (2553057553).

28623020513 is an frugal number, since it uses more digits than its factorization.

28623020513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309 (or 1163 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 28623020513 in words is "twenty-eight billion, six hundred twenty-three million, twenty thousand, five hundred thirteen".