81158470 has 8 divisors (see below), whose sum is σ = 146085264. Its totient is φ = 32463384.

The previous prime is 81158447. The next prime is 81158471. The reversal of 81158470 is 7485118.

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 (81158471) 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, 4057914 + ... + 4057933.

It is an arithmetic number, because the mean of its divisors is an integer number (18260658).

Almost surely, 2^81158470 is an apocalyptic number.

81158470 is a deficient number, since it is larger than the sum of its proper divisors (64926794).

81158470 is a wasteful number, since it uses less digits than its factorization.

81158470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8115854.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 81158470 is about 9008.7995870704. The cubic root of 81158470 is about 432.9568518360.

The spelling of 81158470 in words is "eighty-one million, one hundred fifty-eight thousand, four hundred seventy".