73278731 has 2 divisors, whose sum is σ = 73278732. Its totient is φ = 73278730.

The previous prime is 73278727. The next prime is 73278739. The reversal of 73278731 is 13787237.

It is a weak prime.

It is an emirp because it is prime and its reverse (13787237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73278731 - 2² = 73278727 is a prime.

It is a super-2 number, since 2×73278731² = 10739544833940722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73278739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36639365 + 36639366.

It is an arithmetic number, because the mean of its divisors is an integer number (36639366).

Almost surely, 2^73278731 is an apocalyptic number.

73278731 is a deficient number, since it is larger than the sum of its proper divisors (1).

73278731 is an equidigital number, since it uses as much as digits as its factorization.

73278731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 38.

The square root of 73278731 is about 8560.2997026973. The cubic root of 73278731 is about 418.4651670793.

The spelling of 73278731 in words is "seventy-three million, two hundred seventy-eight thousand, seven hundred thirty-one".