65378640 has 40 divisors (see below), whose sum is σ = 202674528. Its totient is φ = 17434240.

The previous prime is 65378633. The next prime is 65378657. The reversal of 65378640 is 4687356.

65378640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135966 + ... + 136445.

Almost surely, 2^65378640 is an apocalyptic number.

65378640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65378640 is an abundant number, since it is smaller than the sum of its proper divisors (137295888).

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

65378640 is a wasteful number, since it uses less digits than its factorization.

65378640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272427 (or 272421 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 65378640 is about 8085.7059061037. The cubic root of 65378640 is about 402.8517866311.

The spelling of 65378640 in words is "sixty-five million, three hundred seventy-eight thousand, six hundred forty".