72142421378 has 8 divisors (see below), whose sum is σ = 108221839500. Its totient is φ = 36068474880.

The previous prime is 72142421371. The next prime is 72142421381. The reversal of 72142421378 is 87312424127.

It can be written as a sum of positive squares in 2 ways, for example, as 60435830569 + 11706590809 = 245837^2 + 108197^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×72142421378² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72142421371) 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, 1334783 + ... + 1387778.

Almost surely, 2^72142421378 is an apocalyptic number.

72142421378 is a deficient number, since it is larger than the sum of its proper divisors (36079418122).

72142421378 is a wasteful number, since it uses less digits than its factorization.

72142421378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735812.

The product of its digits is 150528, while the sum is 41.

The spelling of 72142421378 in words is "seventy-two billion, one hundred forty-two million, four hundred twenty-one thousand, three hundred seventy-eight".