72121758 has 16 divisors (see below), whose sum is σ = 151835520. Its totient is φ = 22775256.

The previous prime is 72121757. The next prime is 72121787. The reversal of 72121758 is 85712127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72121757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316210 + ... + 316437.

It is an arithmetic number, because the mean of its divisors is an integer number (9489720).

Almost surely, 2^72121758 is an apocalyptic number.

72121758 is an abundant number, since it is smaller than the sum of its proper divisors (79713762).

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

72121758 is a wasteful number, since it uses less digits than its factorization.

72121758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632671.

The product of its digits is 7840, while the sum is 33.

The square root of 72121758 is about 8492.4530025194. The cubic root of 72121758 is about 416.2511388835.

The spelling of 72121758 in words is "seventy-two million, one hundred twenty-one thousand, seven hundred fifty-eight".