81779654 has 8 divisors (see below), whose sum is σ = 133821288. Its totient is φ = 37172560.

The previous prime is 81779653. The next prime is 81779683. The reversal of 81779654 is 45697718.

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

It is a junction number, because it is equal to n+sod(n) for n = 81779599 and 81779608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81779653) 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, 1858607 + ... + 1858650.

It is an arithmetic number, because the mean of its divisors is an integer number (16727661).

Almost surely, 2^81779654 is an apocalyptic number.

81779654 is a deficient number, since it is larger than the sum of its proper divisors (52041634).

81779654 is a wasteful number, since it uses less digits than its factorization.

81779654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3717270.

The product of its digits is 423360, while the sum is 47.

The square root of 81779654 is about 9043.2103812750. The cubic root of 81779654 is about 434.0586575775.

The spelling of 81779654 in words is "eighty-one million, seven hundred seventy-nine thousand, six hundred fifty-four".