72706520 has 16 divisors (see below), whose sum is σ = 163589760. Its totient is φ = 29082592.

The previous prime is 72706499. The next prime is 72706523. The reversal of 72706520 is 2560727.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72706523) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 908792 + ... + 908871.

It is an arithmetic number, because the mean of its divisors is an integer number (10224360).

Almost surely, 2^72706520 is an apocalyptic number.

It is an amenable number.

72706520 is an abundant number, since it is smaller than the sum of its proper divisors (90883240).

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

72706520 is a wasteful number, since it uses less digits than its factorization.

72706520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817674 (or 1817670 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 72706520 is about 8526.8118309249. The cubic root of 72706520 is about 417.3730977931.

The spelling of 72706520 in words is "seventy-two million, seven hundred six thousand, five hundred twenty".