72428149 has 2 divisors, whose sum is σ = 72428150. Its totient is φ = 72428148.

The previous prime is 72428131. The next prime is 72428159. The reversal of 72428149 is 94182427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50665924 + 21762225 = 7118^2 + 4665^2 .

It is a cyclic number.

It is not a de Polignac number, because 72428149 - 2⁵ = 72428117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72428159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36214074 + 36214075.

It is an arithmetic number, because the mean of its divisors is an integer number (36214075).

Almost surely, 2^72428149 is an apocalyptic number.

It is an amenable number.

72428149 is a deficient number, since it is larger than the sum of its proper divisors (1).

72428149 is an equidigital number, since it uses as much as digits as its factorization.

72428149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 72428149 is about 8510.4729010790. The cubic root of 72428149 is about 416.8397519474.

The spelling of 72428149 in words is "seventy-two million, four hundred twenty-eight thousand, one hundred forty-nine".