71487769 has 2 divisors, whose sum is σ = 71487770. Its totient is φ = 71487768.

The previous prime is 71487751. The next prime is 71487803. The reversal of 71487769 is 96778417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71318025 + 169744 = 8445^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 71487769 - 2⁹ = 71487257 is a prime.

It is a super-2 number, since 2×71487769² = 10221002233194722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71487469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35743884 + 35743885.

It is an arithmetic number, because the mean of its divisors is an integer number (35743885).

Almost surely, 2^71487769 is an apocalyptic number.

It is an amenable number.

71487769 is a deficient number, since it is larger than the sum of its proper divisors (1).

71487769 is an equidigital number, since it uses as much as digits as its factorization.

71487769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 49.

The square root of 71487769 is about 8455.0439975201. The cubic root of 71487769 is about 415.0278570355.

The spelling of 71487769 in words is "seventy-one million, four hundred eighty-seven thousand, seven hundred sixty-nine".