64197378 has 48 divisors (see below), whose sum is σ = 160168320. Its totient is φ = 18203328.

The previous prime is 64197337. The next prime is 64197407. The reversal of 64197378 is 87379146.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15403 + ... + 19121.

It is an arithmetic number, because the mean of its divisors is an integer number (3336840).

Almost surely, 2^64197378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64197378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80084160).

64197378 is an abundant number, since it is smaller than the sum of its proper divisors (95970942).

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

64197378 is a wasteful number, since it uses less digits than its factorization.

64197378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871 (or 3868 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 64197378 is about 8012.3266283895. The cubic root of 64197378 is about 400.4107821673.

The spelling of 64197378 in words is "sixty-four million, one hundred ninety-seven thousand, three hundred seventy-eight".