72753421 has 8 divisors (see below), whose sum is σ = 82958904. Its totient is φ = 63206400.

The previous prime is 72753409. The next prime is 72753449. The reversal of 72753421 is 12435727.

It can be written as a sum of positive squares in 4 ways, for example, as 14062500 + 58690921 = 3750^2 + 7661^2 .

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 72753421 - 2⁵ = 72753389 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 (72753481) 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, 164380 + ... + 164821.

It is an arithmetic number, because the mean of its divisors is an integer number (10369863).

Almost surely, 2^72753421 is an apocalyptic number.

It is an amenable number.

72753421 is a deficient number, since it is larger than the sum of its proper divisors (10205483).

72753421 is a wasteful number, since it uses less digits than its factorization.

72753421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329231.

The product of its digits is 11760, while the sum is 31.

The square root of 72753421 is about 8529.5615948301. The cubic root of 72753421 is about 417.4628238498.

The spelling of 72753421 in words is "seventy-two million, seven hundred fifty-three thousand, four hundred twenty-one".