82780511 has 8 divisors (see below), whose sum is σ = 95059200. Its totient is φ = 71294040.

The previous prime is 82780493. The next prime is 82780559. The reversal of 82780511 is 11508728.

It is a happy number.

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-82780511 is a prime.

It is a super-2 number, since 2×82780511² = 13705226002842242, which 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 (82780561) 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, 197831 + ... + 198248.

It is an arithmetic number, because the mean of its divisors is an integer number (11882400).

Almost surely, 2^82780511 is an apocalyptic number.

82780511 is a deficient number, since it is larger than the sum of its proper divisors (12278689).

82780511 is a wasteful number, since it uses less digits than its factorization.

82780511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396109.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 82780511 is about 9098.3795810023. The cubic root of 82780511 is about 435.8222190628.

The spelling of 82780511 in words is "eighty-two million, seven hundred eighty thousand, five hundred eleven".