72721526 has 4 divisors (see below), whose sum is σ = 109082292. Its totient is φ = 36360762.

The previous prime is 72721511. The next prime is 72721547. The reversal of 72721526 is 62512727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62512727 = 4957 ⋅12611.

It is a junction number, because it is equal to n+sod(n) for n = 72721492 and 72721501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18180380 + ... + 18180383.

It is an arithmetic number, because the mean of its divisors is an integer number (27270573).

Almost surely, 2^72721526 is an apocalyptic number.

72721526 is a deficient number, since it is larger than the sum of its proper divisors (36360766).

72721526 is a wasteful number, since it uses less digits than its factorization.

72721526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36360765.

The product of its digits is 11760, while the sum is 32.

The square root of 72721526 is about 8527.6917158162. The cubic root of 72721526 is about 417.4018098896.

The spelling of 72721526 in words is "seventy-two million, seven hundred twenty-one thousand, five hundred twenty-six".