72521029 has 6 divisors (see below), whose sum is σ = 84361254. Its totient is φ = 62160840.

The previous prime is 72521023. The next prime is 72521051. The reversal of 72521029 is 92012527.

It can be written as a sum of positive squares in only one way, i.e., 47541025 + 24980004 = 6895^2 + 4998^2 .

It is not a de Polignac number, because 72521029 - 2³ = 72521021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72520988 and 72521006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72521021) 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 in 5 ways as a sum of consecutive naturals, for example, 739962 + ... + 740059.

It is an arithmetic number, because the mean of its divisors is an integer number (14060209).

Almost surely, 2^72521029 is an apocalyptic number.

It is an amenable number.

72521029 is a deficient number, since it is larger than the sum of its proper divisors (11840225).

72521029 is a wasteful number, since it uses less digits than its factorization.

72521029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480035 (or 1480028 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 72521029 is about 8515.9279588310. The cubic root of 72521029 is about 417.0178573708.

It can be divided in two parts, 7252 and 1029, that added together give a square (8281 = 91²).

The spelling of 72521029 in words is "seventy-two million, five hundred twenty-one thousand, twenty-nine".