65678040 has 192 divisors, whose sum is σ = 229975200. Its totient is φ = 16837632.

The previous prime is 65678009. The next prime is 65678083. The reversal of 65678040 is 4087656.

It is a happy number.

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 = 65677986 and 65678004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 281764 + ... + 281996.

Almost surely, 2^65678040 is an apocalyptic number.

65678040 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 65678040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114987600).

65678040 is an abundant number, since it is smaller than the sum of its proper divisors (164297160).

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

65678040 is a wasteful number, since it uses less digits than its factorization.

65678040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 65678040 is about 8104.1989116754. The cubic root of 65678040 is about 403.4658005038.

The spelling of 65678040 in words is "sixty-five million, six hundred seventy-eight thousand, forty".