82780545 has 16 divisors (see below), whose sum is σ = 134127360. Its totient is φ = 43590144.

The previous prime is 82780493. The next prime is 82780559. The reversal of 82780545 is 54508728.

It is not a de Polignac number, because 82780545 - 2¹³ = 82772353 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33744 + ... + 36113.

It is an arithmetic number, because the mean of its divisors is an integer number (8382960).

Almost surely, 2^82780545 is an apocalyptic number.

It is an amenable number.

82780545 is a deficient number, since it is larger than the sum of its proper divisors (51346815).

82780545 is a wasteful number, since it uses less digits than its factorization.

82780545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69944.

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 82780545 is about 9098.3814494667. The cubic root of 82780545 is about 435.8222787304.

The spelling of 82780545 in words is "eighty-two million, seven hundred eighty thousand, five hundred forty-five".