128428315 has 32 divisors (see below), whose sum is σ = 167904000. Its totient is φ = 93985920.

The previous prime is 128428273. The next prime is 128428337. The reversal of 128428315 is 513824821.

It is a happy number.

It is not a de Polignac number, because 128428315 - 2⁷ = 128428187 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 608560 + ... + 608770.

It is an arithmetic number, because the mean of its divisors is an integer number (5247000).

Almost surely, 2^128428315 is an apocalyptic number.

128428315 is a deficient number, since it is larger than the sum of its proper divisors (39475685).

128428315 is a wasteful number, since it uses less digits than its factorization.

128428315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its digits is 15360, while the sum is 34.

The square root of 128428315 is about 11332.6217178551. The cubic root of 128428315 is about 504.5299223341.

The spelling of 128428315 in words is "one hundred twenty-eight million, four hundred twenty-eight thousand, three hundred fifteen".