82780562 has 4 divisors (see below), whose sum is σ = 124170846. Its totient is φ = 41390280.

The previous prime is 82780561. The next prime is 82780567. The reversal of 82780562 is 26508728.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 80120401 + 2660161 = 8951^2 + 1631^2 .

It is not an unprimeable number, because it can be changed into a prime (82780561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20695139 + ... + 20695142.

Almost surely, 2^82780562 is an apocalyptic number.

82780562 is a deficient number, since it is larger than the sum of its proper divisors (41390284).

82780562 is a wasteful number, since it uses less digits than its factorization.

82780562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41390283.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 82780562 is about 9098.3823836988. The cubic root of 82780562 is about 435.8223085643.

The spelling of 82780562 in words is "eighty-two million, seven hundred eighty thousand, five hundred sixty-two".