128396772 has 48 divisors (see below), whose sum is σ = 380437120. Its totient is φ = 36684576.

The previous prime is 128396759. The next prime is 128396837. The reversal of 128396772 is 277693821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84163 + ... + 85674.

Almost surely, 2^128396772 is an apocalyptic number.

128396772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128396772 is an abundant number, since it is smaller than the sum of its proper divisors (252040348).

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

128396772 is a wasteful number, since it uses less digits than its factorization.

128396772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169857 (or 169849 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 128396772 is about 11331.2299420672. The cubic root of 128396772 is about 504.4886134519.

It can be divided in two parts, 128 and 396772, that added together give a square (396900 = 630²).

The spelling of 128396772 in words is "one hundred twenty-eight million, three hundred ninety-six thousand, seven hundred seventy-two".