128040751 has 4 divisors (see below), whose sum is σ = 129661600. Its totient is φ = 126419904.

The previous prime is 128040749. The next prime is 128040763. The reversal of 128040751 is 157040821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157040821 = 7 ⋅22434403.

It is a cyclic number.

It is not a de Polignac number, because 128040751 - 2¹ = 128040749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128040151) 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, 810306 + ... + 810463.

It is an arithmetic number, because the mean of its divisors is an integer number (32415400).

Almost surely, 2^128040751 is an apocalyptic number.

128040751 is a deficient number, since it is larger than the sum of its proper divisors (1620849).

128040751 is an equidigital number, since it uses as much as digits as its factorization.

128040751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620848.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 128040751 is about 11315.5093124437. The cubic root of 128040751 is about 504.0218966194.

The spelling of 128040751 in words is "one hundred twenty-eight million, forty thousand, seven hundred fifty-one".