128776238740 has 48 divisors (see below), whose sum is σ = 272551031424. Its totient is φ = 51107472000.

The previous prime is 128776238737. The next prime is 128776238743. The reversal of 128776238740 is 47832677821.

It is an interprime number because it is at equal distance from previous prime (128776238737) and next prime (128776238743).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128776238743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2140065 + ... + 2199415.

It is an arithmetic number, because the mean of its divisors is an integer number (5678146488).

Almost surely, 2^128776238740 is an apocalyptic number.

128776238740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128776238740 is an abundant number, since it is smaller than the sum of its proper divisors (143774792684).

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

128776238740 is a wasteful number, since it uses less digits than its factorization.

128776238740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60208 (or 60206 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 55.

The spelling of 128776238740 in words is "one hundred twenty-eight billion, seven hundred seventy-six million, two hundred thirty-eight thousand, seven hundred forty".