128140840 has 32 divisors (see below), whose sum is σ = 289413000. Its totient is φ = 51061504.

The previous prime is 128140823. The next prime is 128140853. The reversal of 128140840 is 48041821.

It can be written as a sum of positive squares in 4 ways, for example, as 60933636 + 67207204 = 7806^2 + 8198^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128140799 and 128140808.

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, 4806 + ... + 16714.

Almost surely, 2^128140840 is an apocalyptic number.

128140840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128140840 is an abundant number, since it is smaller than the sum of its proper divisors (161272160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128140840 is a wasteful number, since it uses less digits than its factorization.

128140840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12189 (or 12185 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 128140840 is about 11319.9310951966. The cubic root of 128140840 is about 504.1531931225.

The spelling of 128140840 in words is "one hundred twenty-eight million, one hundred forty thousand, eight hundred forty".