83720977 has 2 divisors, whose sum is σ = 83720978. Its totient is φ = 83720976.

The previous prime is 83720963. The next prime is 83720993. The reversal of 83720977 is 77902738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83612736 + 108241 = 9144^2 + 329^2 .

It is a cyclic number.

It is not a de Polignac number, because 83720977 - 2⁷ = 83720849 is a prime.

It is not a weakly prime, because it can be changed into another prime (83720947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41860488 + 41860489.

It is an arithmetic number, because the mean of its divisors is an integer number (41860489).

Almost surely, 2^83720977 is an apocalyptic number.

It is an amenable number.

83720977 is a deficient number, since it is larger than the sum of its proper divisors (1).

83720977 is an equidigital number, since it uses as much as digits as its factorization.

83720977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 83720977 is about 9149.9167755778. The cubic root of 83720977 is about 437.4664607759.

The spelling of 83720977 in words is "eighty-three million, seven hundred twenty thousand, nine hundred seventy-seven".