72404477 has 2 divisors, whose sum is σ = 72404478. Its totient is φ = 72404476.

The previous prime is 72404467. The next prime is 72404489. The reversal of 72404477 is 77440427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72352036 + 52441 = 8506^2 + 229^2 .

It is a cyclic number.

It is not a de Polignac number, because 72404477 - 2⁴ = 72404461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72404407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36202238 + 36202239.

It is an arithmetic number, because the mean of its divisors is an integer number (36202239).

Almost surely, 2^72404477 is an apocalyptic number.

It is an amenable number.

72404477 is a deficient number, since it is larger than the sum of its proper divisors (1).

72404477 is an equidigital number, since it uses as much as digits as its factorization.

72404477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43904, while the sum is 35.

The square root of 72404477 is about 8509.0820303955. The cubic root of 72404477 is about 416.7943344960.

The spelling of 72404477 in words is "seventy-two million, four hundred four thousand, four hundred seventy-seven".