65197440 has 512 divisors, whose sum is σ = 293760000. Its totient is φ = 13547520.

The previous prime is 65197427. The next prime is 65197459. The reversal of 65197440 is 4479156.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65197395 and 65197404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5927035 + ... + 5927045.

It is an arithmetic number, because the mean of its divisors is an integer number (573750).

Almost surely, 2^65197440 is an apocalyptic number.

65197440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65197440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146880000).

65197440 is an abundant number, since it is smaller than the sum of its proper divisors (228562560).

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

65197440 is a wasteful number, since it uses less digits than its factorization.

65197440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 65197440 is about 8074.4931729490. The cubic root of 65197440 is about 402.4792679933.

The spelling of 65197440 in words is "sixty-five million, one hundred ninety-seven thousand, four hundred forty".