72509026 has 4 divisors (see below), whose sum is σ = 108763542. Its totient is φ = 36254512.

The previous prime is 72508981. The next prime is 72509027. The reversal of 72509026 is 62090527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 44957025 + 27552001 = 6705^2 + 5249^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (72509027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18127255 + ... + 18127258.

Almost surely, 2^72509026 is an apocalyptic number.

72509026 is the 5386-th centered pentagonal number.

72509026 is a deficient number, since it is larger than the sum of its proper divisors (36254516).

72509026 is a wasteful number, since it uses less digits than its factorization.

72509026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36254515.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 72509026 is about 8515.2231914378. The cubic root of 72509026 is about 416.9948491409.

The spelling of 72509026 in words is "seventy-two million, five hundred nine thousand, twenty-six".