128456679 has 32 divisors (see below), whose sum is σ = 195277824. Its totient is φ = 74511360.

The previous prime is 128456651. The next prime is 128456681. The reversal of 128456679 is 976654821.

It is not a de Polignac number, because 128456679 - 2¹⁷ = 128325607 is a prime.

It is a super-2 number, since 2×128456679² = 33002236759418082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128456639) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62679 + ... + 64695.

It is an arithmetic number, because the mean of its divisors is an integer number (6102432).

Almost surely, 2^128456679 is an apocalyptic number.

128456679 is a deficient number, since it is larger than the sum of its proper divisors (66821145).

128456679 is a wasteful number, since it uses less digits than its factorization.

128456679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127.

The product of its digits is 725760, while the sum is 48.

The square root of 128456679 is about 11333.8730802846. The cubic root of 128456679 is about 504.5670622056.

The spelling of 128456679 in words is "one hundred twenty-eight million, four hundred fifty-six thousand, six hundred seventy-nine".