82077819 has 16 divisors (see below), whose sum is σ = 116134560. Its totient is φ = 51384320.

The previous prime is 82077817. The next prime is 82077851. The reversal of 82077819 is 91877028.

It is a cyclic number.

It is not a de Polignac number, because 82077819 - 2¹ = 82077817 is a prime.

It is a super-2 number, since 2×82077819² = 13473536743593522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82077817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25027 + ... + 28115.

It is an arithmetic number, because the mean of its divisors is an integer number (7258410).

Almost surely, 2^82077819 is an apocalyptic number.

82077819 is a deficient number, since it is larger than the sum of its proper divisors (34056741).

82077819 is a wasteful number, since it uses less digits than its factorization.

82077819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 82077819 is about 9059.6809546474. The cubic root of 82077819 is about 434.5855373219.

The spelling of 82077819 in words is "eighty-two million, seventy-seven thousand, eight hundred nineteen".