82780549919 has 8 divisors (see below), whose sum is σ = 83247713472. Its totient is φ = 82314408960.

The previous prime is 82780549897. The next prime is 82780549979. The reversal of 82780549919 is 91994508728.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82780549919 is a prime.

It is a super-2 number, since 2×82780549919² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82780549979) 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, 92999 + ... + 417384.

It is an arithmetic number, because the mean of its divisors is an integer number (10405964184).

Almost surely, 2^82780549919 is an apocalyptic number.

82780549919 is a deficient number, since it is larger than the sum of its proper divisors (467163553).

82780549919 is a wasteful number, since it uses less digits than its factorization.

82780549919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511297.

The product of its (nonzero) digits is 13063680, while the sum is 62.

The spelling of 82780549919 in words is "eighty-two billion, seven hundred eighty million, five hundred forty-nine thousand, nine hundred nineteen".