82778355 has 80 divisors (see below), whose sum is σ = 171556704. Its totient is φ = 37739520.

The previous prime is 82778347. The next prime is 82778363. The reversal of 82778355 is 55387728.

It is an interprime number because it is at equal distance from previous prime (82778347) and next prime (82778363).

It is not a de Polignac number, because 82778355 - 2³ = 82778347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 82778355.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 75189 + ... + 76281.

Almost surely, 2^82778355 is an apocalyptic number.

82778355 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

82778355 is an abundant number, since it is smaller than the sum of its proper divisors (88778349).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82778355 is a wasteful number, since it uses less digits than its factorization.

82778355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1129 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 82778355 is about 9098.2610975944. The cubic root of 82778355 is about 435.8184353990.

The spelling of 82778355 in words is "eighty-two million, seven hundred seventy-eight thousand, three hundred fifty-five".