72729652 has 6 divisors (see below), whose sum is σ = 127276898. Its totient is φ = 36364824.

The previous prime is 72729647. The next prime is 72729653. The reversal of 72729652 is 25692727.

It can be written as a sum of positive squares in only one way, i.e., 60155536 + 12574116 = 7756^2 + 3546^2 .

It is a super-2 number, since 2×72729652² = 10579204560082208, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72729653) 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, 9091203 + ... + 9091210.

Almost surely, 2^72729652 is an apocalyptic number.

It is an amenable number.

72729652 is a deficient number, since it is larger than the sum of its proper divisors (54547246).

72729652 is a wasteful number, since it uses less digits than its factorization.

72729652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18182417 (or 18182415 counting only the distinct ones).

The product of its digits is 105840, while the sum is 40.

The square root of 72729652 is about 8528.1681503122. The cubic root of 72729652 is about 417.4173563216.

The spelling of 72729652 in words is "seventy-two million, seven hundred twenty-nine thousand, six hundred fifty-two".