65987140 has 12 divisors (see below), whose sum is σ = 138573036. Its totient is φ = 26394848.

The previous prime is 65987137. The next prime is 65987143. The reversal of 65987140 is 4178956.

It is an interprime number because it is at equal distance from previous prime (65987137) and next prime (65987143).

It can be written as a sum of positive squares in 2 ways, for example, as 42016324 + 23970816 = 6482^2 + 4896^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65987093 and 65987102.

It is not an unprimeable number, because it can be changed into a prime (65987143) 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, 1649659 + ... + 1649698.

It is an arithmetic number, because the mean of its divisors is an integer number (11547753).

Almost surely, 2^65987140 is an apocalyptic number.

It is an amenable number.

65987140 is an abundant number, since it is smaller than the sum of its proper divisors (72585896).

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

65987140 is a wasteful number, since it uses less digits than its factorization.

65987140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299366 (or 3299364 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 65987140 is about 8123.2468877906. The cubic root of 65987140 is about 404.0977527074.

The spelling of 65987140 in words is "sixty-five million, nine hundred eighty-seven thousand, one hundred forty".