81026390 has 8 divisors (see below), whose sum is σ = 145847520. Its totient is φ = 32410552.

The previous prime is 81026371. The next prime is 81026399. The reversal of 81026390 is 9362018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81026399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4051310 + ... + 4051329.

It is an arithmetic number, because the mean of its divisors is an integer number (18230940).

Almost surely, 2^81026390 is an apocalyptic number.

81026390 is a deficient number, since it is larger than the sum of its proper divisors (64821130).

81026390 is a wasteful number, since it uses less digits than its factorization.

81026390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8102646.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 81026390 is about 9001.4659917149. The cubic root of 81026390 is about 432.7218548372.

The spelling of 81026390 in words is "eighty-one million, twenty-six thousand, three hundred ninety".