72121534 has 8 divisors (see below), whose sum is σ = 108328608. Its totient is φ = 36012000.

The previous prime is 72121529. The next prime is 72121559. The reversal of 72121534 is 43512127.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 72121499 and 72121508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22507 + ... + 25510.

It is an arithmetic number, because the mean of its divisors is an integer number (13541076).

Almost surely, 2^72121534 is an apocalyptic number.

72121534 is a deficient number, since it is larger than the sum of its proper divisors (36207074).

72121534 is a wasteful number, since it uses less digits than its factorization.

72121534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48770.

The product of its digits is 1680, while the sum is 25.

The square root of 72121534 is about 8492.4398143290. The cubic root of 72121534 is about 416.2507079440.

The spelling of 72121534 in words is "seventy-two million, one hundred twenty-one thousand, five hundred thirty-four".