86720477 has 2 divisors, whose sum is σ = 86720478. Its totient is φ = 86720476.

The previous prime is 86720471. The next prime is 86720483. The reversal of 86720477 is 77402768.

It is a balanced prime because it is at equal distance from previous prime (86720471) and next prime (86720483).

It can be written as a sum of positive squares in only one way, i.e., 77545636 + 9174841 = 8806^2 + 3029^2 .

It is a cyclic number.

It is not a de Polignac number, because 86720477 - 2²² = 82526173 is a prime.

It is a super-2 number, since 2×86720477² = 15040882262215058, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86720471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43360238 + 43360239.

It is an arithmetic number, because the mean of its divisors is an integer number (43360239).

Almost surely, 2^86720477 is an apocalyptic number.

It is an amenable number.

86720477 is a deficient number, since it is larger than the sum of its proper divisors (1).

86720477 is an equidigital number, since it uses as much as digits as its factorization.

86720477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 86720477 is about 9312.3829925535. The cubic root of 86720477 is about 442.6297014115.

The spelling of 86720477 in words is "eighty-six million, seven hundred twenty thousand, four hundred seventy-seven".