128261740 has 24 divisors (see below), whose sum is σ = 270486720. Its totient is φ = 51088128.

The previous prime is 128261737. The next prime is 128261743. The reversal of 128261740 is 47162821.

It is an interprime number because it is at equal distance from previous prime (128261737) and next prime (128261743).

It is not an unprimeable number, because it can be changed into a prime (128261743) 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, 8637 + ... + 18196.

It is an arithmetic number, because the mean of its divisors is an integer number (11270280).

Almost surely, 2^128261740 is an apocalyptic number.

128261740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128261740 is an abundant number, since it is smaller than the sum of its proper divisors (142224980).

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

128261740 is a wasteful number, since it uses less digits than its factorization.

128261740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27081 (or 27079 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 128261740 is about 11325.2699747070. The cubic root of 128261740 is about 504.3116983052.

The spelling of 128261740 in words is "one hundred twenty-eight million, two hundred sixty-one thousand, seven hundred forty".