128988783 has 36 divisors (see below), whose sum is σ = 234065104. Its totient is φ = 67003200.

The previous prime is 128988779. The next prime is 128988787. The reversal of 128988783 is 387889821.

It is an interprime number because it is at equal distance from previous prime (128988779) and next prime (128988787).

It is not a de Polignac number, because 128988783 - 2² = 128988779 is a prime.

It is a super-2 number, since 2×128988783² = 33276212279642178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128988787) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 838 + ... + 16083.

Almost surely, 2^128988783 is an apocalyptic number.

128988783 is a deficient number, since it is larger than the sum of its proper divisors (105076321).

128988783 is a wasteful number, since it uses less digits than its factorization.

128988783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16956 (or 16942 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 128988783 is about 11357.3228799748. The cubic root of 128988783 is about 505.2627890845.

The spelling of 128988783 in words is "one hundred twenty-eight million, nine hundred eighty-eight thousand, seven hundred eighty-three".