128440474 has 16 divisors (see below), whose sum is σ = 207042048. Its totient is φ = 59539392.

The previous prime is 128440469. The next prime is 128440517. The reversal of 128440474 is 474044821.

It is a super-2 number, since 2×128440474² = 32993910722689352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25914 + ... + 30469.

It is an arithmetic number, because the mean of its divisors is an integer number (12940128).

Almost surely, 2^128440474 is an apocalyptic number.

128440474 is a deficient number, since it is larger than the sum of its proper divisors (78601574).

128440474 is a wasteful number, since it uses less digits than its factorization.

128440474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56469.

The product of its (nonzero) digits is 28672, while the sum is 34.

The square root of 128440474 is about 11333.1581653130. The cubic root of 128440474 is about 504.5458440196.

The spelling of 128440474 in words is "one hundred twenty-eight million, four hundred forty thousand, four hundred seventy-four".