72123780 has 24 divisors (see below), whose sum is σ = 201946752. Its totient is φ = 19232992.

The previous prime is 72123757. The next prime is 72123811. The reversal of 72123780 is 8732127.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600972 + ... + 601091.

It is an arithmetic number, because the mean of its divisors is an integer number (8414448).

Almost surely, 2^72123780 is an apocalyptic number.

It is an amenable number.

72123780 is an abundant number, since it is smaller than the sum of its proper divisors (129822972).

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

72123780 is a wasteful number, since it uses less digits than its factorization.

72123780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202075 (or 1202073 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 72123780 is about 8492.5720485610. The cubic root of 72123780 is about 416.2550288420.

The spelling of 72123780 in words is "seventy-two million, one hundred twenty-three thousand, seven hundred eighty".