128925216 has 96 divisors (see below), whose sum is σ = 429770880. Its totient is φ = 36834048.

The previous prime is 128925211. The next prime is 128925221. The reversal of 128925216 is 612529821.

128925216 is a `hidden beast` number, since 128 + 9 + 2 + 521 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (128925211) and next prime (128925221).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-4 number, since 4×128925216⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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

It is not an unprimeable number, because it can be changed into a prime (128925211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4611 + ... + 16706.

It is an arithmetic number, because the mean of its divisors is an integer number (4476780).

Almost surely, 2^128925216 is an apocalyptic number.

128925216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128925216 is an abundant number, since it is smaller than the sum of its proper divisors (300845664).

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

128925216 is a wasteful number, since it uses less digits than its factorization.

128925216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21343 (or 21329 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 128925216 is about 11354.5240322966. The cubic root of 128925216 is about 505.1797758786.

The spelling of 128925216 in words is "one hundred twenty-eight million, nine hundred twenty-five thousand, two hundred sixteen".