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72504247 = 193816013
BaseRepresentation
bin1000101001001…
…01001110110111
312001102121010111
410110211032313
5122030113442
611110003451
71540163434
oct424451667
9161377114
1072504247
1137a21572
1220346587
131203762a
1498b4b8b
156572b17
hex45253b7

72504247 has 4 divisors (see below), whose sum is σ = 76320280. Its totient is φ = 68688216.

The previous prime is 72504239. The next prime is 72504283. The reversal of 72504247 is 74240527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74240527 = 233227849.

It is a cyclic number.

It is not a de Polignac number, because 72504247 - 23 = 72504239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72504217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1907988 + ... + 1908025.

It is an arithmetic number, because the mean of its divisors is an integer number (19080070).

Almost surely, 272504247 is an apocalyptic number.

72504247 is a deficient number, since it is larger than the sum of its proper divisors (3816033).

72504247 is a wasteful number, since it uses less digits than its factorization.

72504247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816032.

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 72504247 is about 8514.9425717382. The cubic root of 72504247 is about 416.9856876968.

The spelling of 72504247 in words is "seventy-two million, five hundred four thousand, two hundred forty-seven".

Divisors: 1 19 3816013 72504247