128615803 has 4 divisors (see below), whose sum is σ = 128830408. Its totient is φ = 128401200.

The previous prime is 128615797. The next prime is 128615833. The reversal of 128615803 is 308516821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 308516821 = 1103 ⋅279707.

It is a cyclic number.

It is not a de Polignac number, because 128615803 - 2²⁵ = 95061371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128615833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106401 + ... + 107602.

It is an arithmetic number, because the mean of its divisors is an integer number (32207602).

Almost surely, 2^128615803 is an apocalyptic number.

128615803 is a deficient number, since it is larger than the sum of its proper divisors (214605).

128615803 is an equidigital number, since it uses as much as digits as its factorization.

128615803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214604.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 128615803 is about 11340.8907498485. The cubic root of 128615803 is about 504.7753181469.

The spelling of 128615803 in words is "one hundred twenty-eight million, six hundred fifteen thousand, eight hundred three".