128456870 has 24 divisors (see below), whose sum is σ = 238939632. Its totient is φ = 49721520.

The previous prime is 128456869. The next prime is 128456873. The reversal of 128456870 is 78654821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128456873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2927 + ... + 16293.

It is an arithmetic number, because the mean of its divisors is an integer number (9955818).

Almost surely, 2^128456870 is an apocalyptic number.

128456870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128456870 is a deficient number, since it is larger than the sum of its proper divisors (110482762).

128456870 is a wasteful number, since it uses less digits than its factorization.

128456870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13436 (or 13405 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 128456870 is about 11333.8815063508. The cubic root of 128456870 is about 504.5673122828.

The spelling of 128456870 in words is "one hundred twenty-eight million, four hundred fifty-six thousand, eight hundred seventy".