128188772 has 18 divisors (see below), whose sum is σ = 237699378. Its totient is φ = 60280192.

The previous prime is 128188759. The next prime is 128188793. The reversal of 128188772 is 277881821.

It can be written as a sum of positive squares in 3 ways, for example, as 112869376 + 15319396 = 10624^2 + 3914^2 .

It is a super-2 number, since 2×128188772² = 32864722533735968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92678 + ... + 94050.

It is an arithmetic number, because the mean of its divisors is an integer number (13205521).

Almost surely, 2^128188772 is an apocalyptic number.

It is an amenable number.

128188772 is a deficient number, since it is larger than the sum of its proper divisors (109510606).

128188772 is an equidigital number, since it uses as much as digits as its factorization.

128188772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 1392 counting only the distinct ones).

The product of its digits is 100352, while the sum is 44.

The square root of 128188772 is about 11322.0480479461. The cubic root of 128188772 is about 504.2160459919.

The spelling of 128188772 in words is "one hundred twenty-eight million, one hundred eighty-eight thousand, seven hundred seventy-two".