86978357 has 2 divisors, whose sum is σ = 86978358. Its totient is φ = 86978356.

The previous prime is 86978347. The next prime is 86978369. The reversal of 86978357 is 75387968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84805681 + 2172676 = 9209^2 + 1474^2 .

It is a cyclic number.

It is not a de Polignac number, because 86978357 - 2¹⁰ = 86977333 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 86978299 and 86978308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86978317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43489178 + 43489179.

It is an arithmetic number, because the mean of its divisors is an integer number (43489179).

Almost surely, 2^86978357 is an apocalyptic number.

It is an amenable number.

86978357 is a deficient number, since it is larger than the sum of its proper divisors (1).

86978357 is an equidigital number, since it uses as much as digits as its factorization.

86978357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The square root of 86978357 is about 9326.2187943453. The cubic root of 86978357 is about 443.0680153812.

The spelling of 86978357 in words is "eighty-six million, nine hundred seventy-eight thousand, three hundred fifty-seven".