72428671 has 4 divisors (see below), whose sum is σ = 82775632. Its totient is φ = 62081712.

The previous prime is 72428669. The next prime is 72428683. The reversal of 72428671 is 17682427.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72428671 - 2¹ = 72428669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72428671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72428611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5173470 + ... + 5173483.

It is an arithmetic number, because the mean of its divisors is an integer number (20693908).

Almost surely, 2^72428671 is an apocalyptic number.

72428671 is a deficient number, since it is larger than the sum of its proper divisors (10346961).

72428671 is a wasteful number, since it uses less digits than its factorization.

72428671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10346960.

The product of its digits is 37632, while the sum is 37.

The square root of 72428671 is about 8510.5035691197. The cubic root of 72428671 is about 416.8407533528.

The spelling of 72428671 in words is "seventy-two million, four hundred twenty-eight thousand, six hundred seventy-one".