81779483 has 8 divisors (see below), whose sum is σ = 83758080. Its totient is φ = 79810920.

The previous prime is 81779479. The next prime is 81779521. The reversal of 81779483 is 38497718.

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

It is a cyclic number.

It is not a de Polignac number, because 81779483 - 2² = 81779479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81779443) 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, 15518 + ... + 20108.

It is an arithmetic number, because the mean of its divisors is an integer number (10469760).

Almost surely, 2^81779483 is an apocalyptic number.

81779483 is a deficient number, since it is larger than the sum of its proper divisors (1978597).

81779483 is a wasteful number, since it uses less digits than its factorization.

81779483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5017.

The product of its digits is 338688, while the sum is 47.

The square root of 81779483 is about 9043.2009266631. The cubic root of 81779483 is about 434.0583550406.

The spelling of 81779483 in words is "eighty-one million, seven hundred seventy-nine thousand, four hundred eighty-three".