81732407 has 2 divisors, whose sum is σ = 81732408. Its totient is φ = 81732406.

The previous prime is 81732403. The next prime is 81732421. The reversal of 81732407 is 70423718.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81732407 - 2² = 81732403 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81732403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40866203 + 40866204.

It is an arithmetic number, because the mean of its divisors is an integer number (40866204).

Almost surely, 2^81732407 is an apocalyptic number.

81732407 is a deficient number, since it is larger than the sum of its proper divisors (1).

81732407 is an equidigital number, since it uses as much as digits as its factorization.

81732407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 81732407 is about 9040.5977125409. The cubic root of 81732407 is about 433.9750511259.

The spelling of 81732407 in words is "eighty-one million, seven hundred thirty-two thousand, four hundred seven".