72281887 has 2 divisors, whose sum is σ = 72281888. Its totient is φ = 72281886.

The previous prime is 72281873. The next prime is 72281917. The reversal of 72281887 is 78818227.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72281887 - 2¹¹ = 72279839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72281827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36140943 + 36140944.

It is an arithmetic number, because the mean of its divisors is an integer number (36140944).

Almost surely, 2^72281887 is an apocalyptic number.

72281887 is a deficient number, since it is larger than the sum of its proper divisors (1).

72281887 is an equidigital number, since it uses as much as digits as its factorization.

72281887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100352, while the sum is 43.

The square root of 72281887 is about 8501.8754989708. The cubic root of 72281887 is about 416.5589729851.

The spelling of 72281887 in words is "seventy-two million, two hundred eighty-one thousand, eight hundred eighty-seven".