72100428 has 12 divisors (see below), whose sum is σ = 168234360. Its totient is φ = 24033472.

The previous prime is 72100411. The next prime is 72100481. The reversal of 72100428 is 82400127.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 72100398 and 72100407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3004173 + ... + 3004196.

It is an arithmetic number, because the mean of its divisors is an integer number (14019530).

Almost surely, 2^72100428 is an apocalyptic number.

It is an amenable number.

72100428 is an abundant number, since it is smaller than the sum of its proper divisors (96133932).

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

72100428 is a wasteful number, since it uses less digits than its factorization.

72100428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6008376 (or 6008374 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 72100428 is about 8491.1970887502. The cubic root of 72100428 is about 416.2100994318.

The spelling of 72100428 in words is "seventy-two million, one hundred thousand, four hundred twenty-eight".