86725621 has 6 divisors (see below), whose sum is σ = 87790070. Its totient is φ = 85673928.

The previous prime is 86725603. The next prime is 86725643. The reversal of 86725621 is 12652768.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 55800900 + 30924721 = 7470^2 + 5561^2 .

It is not a de Polignac number, because 86725621 - 2¹¹ = 86723573 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 (86725601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 595 + ... + 13183.

Almost surely, 2^86725621 is an apocalyptic number.

It is an amenable number.

86725621 is a deficient number, since it is larger than the sum of its proper divisors (1064449).

86725621 is an equidigital number, since it uses as much as digits as its factorization.

86725621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12755 (or 12672 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 86725621 is about 9312.6591798476. The cubic root of 86725621 is about 442.6384530629.

The spelling of 86725621 in words is "eighty-six million, seven hundred twenty-five thousand, six hundred twenty-one".