128137240 has 64 divisors (see below), whose sum is σ = 359458560. Its totient is φ = 39937920.

The previous prime is 128137231. The next prime is 128137249. The reversal of 128137240 is 42731821.

It is an interprime number because it is at equal distance from previous prime (128137231) and next prime (128137249).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 128137199 and 128137208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128137249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17722 + ... + 23881.

It is an arithmetic number, because the mean of its divisors is an integer number (5616540).

Almost surely, 2^128137240 is an apocalyptic number.

128137240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128137240 is an abundant number, since it is smaller than the sum of its proper divisors (231321320).

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

128137240 is a wasteful number, since it uses less digits than its factorization.

128137240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41632 (or 41628 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 128137240 is about 11319.7720825112. The cubic root of 128137240 is about 504.1484718369.

The spelling of 128137240 in words is "one hundred twenty-eight million, one hundred thirty-seven thousand, two hundred forty".