65878740 has 72 divisors (see below), whose sum is σ = 211596840. Its totient is φ = 16533504.

The previous prime is 65878727. The next prime is 65878741. The reversal of 65878740 is 4787856.

It can be written as a sum of positive squares in 4 ways, for example, as 5225796 + 60652944 = 2286^2 + 7788^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65878741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7705 + ... + 13824.

It is an arithmetic number, because the mean of its divisors is an integer number (2938845).

Almost surely, 2^65878740 is an apocalyptic number.

65878740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65878740 is an abundant number, since it is smaller than the sum of its proper divisors (145718100).

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

65878740 is a wasteful number, since it uses less digits than its factorization.

65878740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21561 (or 21556 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 65878740 is about 8116.5719364766. The cubic root of 65878740 is about 403.8763549994.

The spelling of 65878740 in words is "sixty-five million, eight hundred seventy-eight thousand, seven hundred forty".