82978477 has 2 divisors, whose sum is σ = 82978478. Its totient is φ = 82978476.

The previous prime is 82978451. The next prime is 82978501. The reversal of 82978477 is 77487928.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69538921 + 13439556 = 8339^2 + 3666^2 .

It is a cyclic number.

It is not a de Polignac number, because 82978477 - 2²³ = 74589869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82978417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41489238 + 41489239.

It is an arithmetic number, because the mean of its divisors is an integer number (41489239).

Almost surely, 2^82978477 is an apocalyptic number.

It is an amenable number.

82978477 is a deficient number, since it is larger than the sum of its proper divisors (1).

82978477 is an equidigital number, since it uses as much as digits as its factorization.

82978477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1580544, while the sum is 52.

The square root of 82978477 is about 9109.2522744735. The cubic root of 82978477 is about 436.1693591280.

The spelling of 82978477 in words is "eighty-two million, nine hundred seventy-eight thousand, four hundred seventy-seven".