72706420 has 12 divisors (see below), whose sum is σ = 152683524. Its totient is φ = 29082560.

The previous prime is 72706409. The next prime is 72706453. The reversal of 72706420 is 2460727.

It can be written as a sum of positive squares in 2 ways, for example, as 21641104 + 51065316 = 4652^2 + 7146^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 1817641 + ... + 1817680.

It is an arithmetic number, because the mean of its divisors is an integer number (12723627).

Almost surely, 2^72706420 is an apocalyptic number.

It is an amenable number.

72706420 is an abundant number, since it is smaller than the sum of its proper divisors (79977104).

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

72706420 is a wasteful number, since it uses less digits than its factorization.

72706420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635330 (or 3635328 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 72706420 is about 8526.8059670664. The cubic root of 72706420 is about 417.3729064424.

The spelling of 72706420 in words is "seventy-two million, seven hundred six thousand, four hundred twenty".