86797640 has 16 divisors (see below), whose sum is σ = 195294780. Its totient is φ = 34719040.

The previous prime is 86797639. The next prime is 86797649. The reversal of 86797640 is 4679768.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 82773604 + 4024036 = 9098^2 + 2006^2 .

It is a super-3 number, since 3×86797640³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (86797649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1084931 + ... + 1085010.

Almost surely, 2^86797640 is an apocalyptic number.

It is an amenable number.

86797640 is an abundant number, since it is smaller than the sum of its proper divisors (108497140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86797640 is a wasteful number, since it uses less digits than its factorization.

86797640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169952 (or 2169948 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 86797640 is about 9316.5251032775. The cubic root of 86797640 is about 442.7609449643.

The spelling of 86797640 in words is "eighty-six million, seven hundred ninety-seven thousand, six hundred forty".