72704405 has 8 divisors (see below), whose sum is σ = 87372600. Its totient is φ = 58078656.

The previous prime is 72704383. The next prime is 72704407. The reversal of 72704405 is 50440727.

It can be written as a sum of positive squares in 4 ways, for example, as 131044 + 72573361 = 362^2 + 8519^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72704405 - 2¹⁰ = 72703381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72704407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6710 + ... + 13799.

It is an arithmetic number, because the mean of its divisors is an integer number (10921575).

Almost surely, 2^72704405 is an apocalyptic number.

It is an amenable number.

72704405 is a deficient number, since it is larger than the sum of its proper divisors (14668195).

72704405 is a wasteful number, since it uses less digits than its factorization.

72704405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21223.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 72704405 is about 8526.6878094604. The cubic root of 72704405 is about 417.3690506885.

The spelling of 72704405 in words is "seventy-two million, seven hundred four thousand, four hundred five".