128767640 has 32 divisors (see below), whose sum is σ = 290742480. Its totient is φ = 51326592.

The previous prime is 128767637. The next prime is 128767643. The reversal of 128767640 is 46767821.

It is an interprime number because it is at equal distance from previous prime (128767637) and next prime (128767643).

It is a super-2 number, since 2×128767640² = 33162210222339200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128767643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6227 + ... + 17213.

Almost surely, 2^128767640 is an apocalyptic number.

128767640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128767640 is an abundant number, since it is smaller than the sum of its proper divisors (161974840).

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

128767640 is a wasteful number, since it uses less digits than its factorization.

128767640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11291 (or 11287 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 128767640 is about 11347.5830025605. The cubic root of 128767640 is about 504.9738770267.

The spelling of 128767640 in words is "one hundred twenty-eight million, seven hundred sixty-seven thousand, six hundred forty".