128540772 has 36 divisors (see below), whose sum is σ = 328844880. Its totient is φ = 42329712.

The previous prime is 128540761. The next prime is 128540827. The reversal of 128540772 is 277045821.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18522 + ... + 24497.

It is an arithmetic number, because the mean of its divisors is an integer number (9134580).

Almost surely, 2^128540772 is an apocalyptic number.

128540772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128540772 is an abundant number, since it is smaller than the sum of its proper divisors (200304108).

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

128540772 is a wasteful number, since it uses less digits than its factorization.

128540772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43112 (or 43107 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 128540772 is about 11337.5822819506. The cubic root of 128540772 is about 504.6771416054.

The spelling of 128540772 in words is "one hundred twenty-eight million, five hundred forty thousand, seven hundred seventy-two".