81379190 has 8 divisors (see below), whose sum is σ = 146482560. Its totient is φ = 32551672.

The previous prime is 81379183. The next prime is 81379201. The reversal of 81379190 is 9197318.

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

It is a super-2 number, since 2×81379190² = 13245145130112200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4068950 + ... + 4068969.

It is an arithmetic number, because the mean of its divisors is an integer number (18310320).

Almost surely, 2^81379190 is an apocalyptic number.

81379190 is a deficient number, since it is larger than the sum of its proper divisors (65103370).

81379190 is a wasteful number, since it uses less digits than its factorization.

81379190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8137926.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 81379190 is about 9021.0415141490. The cubic root of 81379190 is about 433.3489889150.

The spelling of 81379190 in words is "eighty-one million, three hundred seventy-nine thousand, one hundred ninety".