64218378 has 16 divisors (see below), whose sum is σ = 146784960. Its totient is φ = 18348096.

The previous prime is 64218377. The next prime is 64218397. The reversal of 64218378 is 87381246.

It is not an unprimeable number, because it can be changed into a prime (64218377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764463 + ... + 764546.

It is an arithmetic number, because the mean of its divisors is an integer number (9174060).

Almost surely, 2^64218378 is an apocalyptic number.

64218378 is an abundant number, since it is smaller than the sum of its proper divisors (82566582).

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

64218378 is a wasteful number, since it uses less digits than its factorization.

64218378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529021.

The product of its digits is 64512, while the sum is 39.

The square root of 64218378 is about 8013.6370020110. The cubic root of 64218378 is about 400.4544376871.

The spelling of 64218378 in words is "sixty-four million, two hundred eighteen thousand, three hundred seventy-eight".