81363416 has 8 divisors (see below), whose sum is σ = 152556420. Its totient is φ = 40681704.

The previous prime is 81363413. The next prime is 81363461. The reversal of 81363416 is 61436318.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81363413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5085206 + ... + 5085221.

Almost surely, 2^81363416 is an apocalyptic number.

It is an amenable number.

81363416 is a deficient number, since it is larger than the sum of its proper divisors (71193004).

81363416 is a wasteful number, since it uses less digits than its factorization.

81363416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10170433 (or 10170429 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 81363416 is about 9020.1671824861. The cubic root of 81363416 is about 433.3209879455.

The spelling of 81363416 in words is "eighty-one million, three hundred sixty-three thousand, four hundred sixteen".