65197940 has 24 divisors (see below), whose sum is σ = 137200392. Its totient is φ = 26024960.

The previous prime is 65197931. The next prime is 65197961. The reversal of 65197940 is 4979156.

It can be written as a sum of positive squares in 4 ways, for example, as 18028516 + 47169424 = 4246^2 + 6868^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7292 + ... + 13548.

It is an arithmetic number, because the mean of its divisors is an integer number (5716683).

Almost surely, 2^65197940 is an apocalyptic number.

It is an amenable number.

65197940 is an abundant number, since it is smaller than the sum of its proper divisors (72002452).

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

65197940 is a wasteful number, since it uses less digits than its factorization.

65197940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6787 (or 6785 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 65197940 is about 8074.5241345853. The cubic root of 65197940 is about 402.4802968635.

The spelling of 65197940 in words is "sixty-five million, one hundred ninety-seven thousand, nine hundred forty".