81077438 has 16 divisors (see below), whose sum is σ = 136666656. Its totient is φ = 35793120.

The previous prime is 81077413. The next prime is 81077467. The reversal of 81077438 is 83477018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67193 + ... + 68388.

It is an arithmetic number, because the mean of its divisors is an integer number (8541666).

Almost surely, 2^81077438 is an apocalyptic number.

81077438 is a deficient number, since it is larger than the sum of its proper divisors (55589218).

81077438 is a wasteful number, since it uses less digits than its factorization.

81077438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135619.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 81077438 is about 9004.3010833712. The cubic root of 81077438 is about 432.8127097958.

The spelling of 81077438 in words is "eighty-one million, seventy-seven thousand, four hundred thirty-eight".