72521030 has 32 divisors (see below), whose sum is σ = 134174880. Its totient is φ = 28211200.

The previous prime is 72521023. The next prime is 72521051. The reversal of 72521030 is 3012527.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72520993 and 72521011.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 58982 + ... + 60198.

It is an arithmetic number, because the mean of its divisors is an integer number (4192965).

Almost surely, 2^72521030 is an apocalyptic number.

72521030 is a deficient number, since it is larger than the sum of its proper divisors (61653850).

72521030 is a wasteful number, since it uses less digits than its factorization.

72521030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 72521030 is about 8515.9280175445. The cubic root of 72521030 is about 417.0178592876.

Adding to 72521030 its reverse (3012527), we get a palindrome (75533557).

The spelling of 72521030 in words is "seventy-two million, five hundred twenty-one thousand, thirty".