72101428 has 48 divisors (see below), whose sum is σ = 152629120. Its totient is φ = 29113344.

The previous prime is 72101401. The next prime is 72101459. The reversal of 72101428 is 82410127.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166300 + ... + 166732.

Almost surely, 2^72101428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72101428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76314560).

72101428 is an abundant number, since it is smaller than the sum of its proper divisors (80527692).

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

72101428 is a wasteful number, since it uses less digits than its factorization.

72101428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776 (or 774 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 72101428 is about 8491.2559730584. The cubic root of 72101428 is about 416.2120236375.

The spelling of 72101428 in words is "seventy-two million, one hundred one thousand, four hundred twenty-eight".