81930586 has 8 divisors (see below), whose sum is σ = 124979040. Its totient is φ = 40270908.

The previous prime is 81930581. The next prime is 81930643. The reversal of 81930586 is 68503918.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (81930581) 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, 347046 + ... + 347281.

It is an arithmetic number, because the mean of its divisors is an integer number (15622380).

Almost surely, 2^81930586 is an apocalyptic number.

81930586 is a deficient number, since it is larger than the sum of its proper divisors (43048454).

81930586 is a wasteful number, since it uses less digits than its factorization.

81930586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694388.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 81930586 is about 9051.5515797017. The cubic root of 81930586 is about 434.3255254177.

The spelling of 81930586 in words is "eighty-one million, nine hundred thirty thousand, five hundred eighty-six".