86697621 has 10 divisors (see below), whose sum is σ = 129511382. Its totient is φ = 57798360.

The previous prime is 86697593. The next prime is 86697629. The reversal of 86697621 is 12679668.

It can be written as a sum of positive squares in only one way, i.e., 77000625 + 9696996 = 8775^2 + 3114^2 .

It is not a de Polignac number, because 86697621 - 2⁹ = 86697109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86697629) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 535090 + ... + 535251.

Almost surely, 2^86697621 is an apocalyptic number.

86697621 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

86697621 is a deficient number, since it is larger than the sum of its proper divisors (42813761).

86697621 is a wasteful number, since it uses less digits than its factorization.

86697621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070353 (or 1070344 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 86697621 is about 9311.1557284797. The cubic root of 86697621 is about 442.5908115832.

It can be divided in two parts, 8669 and 7621, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 86697621 in words is "eighty-six million, six hundred ninety-seven thousand, six hundred twenty-one".