81958462 has 16 divisors (see below), whose sum is σ = 130561200. Its totient is φ = 38452608.

The previous prime is 81958417. The next prime is 81958463. The reversal of 81958462 is 26485918.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81958463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8413 + ... + 15319.

It is an arithmetic number, because the mean of its divisors is an integer number (8160075).

Almost surely, 2^81958462 is an apocalyptic number.

81958462 is a deficient number, since it is larger than the sum of its proper divisors (48602738).

81958462 is a wasteful number, since it uses less digits than its factorization.

81958462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7275.

The product of its digits is 138240, while the sum is 43.

The square root of 81958462 is about 9053.0912952427. The cubic root of 81958462 is about 434.3747780272.

The spelling of 81958462 in words is "eighty-one million, nine hundred fifty-eight thousand, four hundred sixty-two".