64278380 has 24 divisors (see below), whose sum is σ = 135310560. Its totient is φ = 25649280.

The previous prime is 64278341. The next prime is 64278397. The reversal of 64278380 is 8387246.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5120 + ... + 12440.

It is an arithmetic number, because the mean of its divisors is an integer number (5637940).

Almost surely, 2^64278380 is an apocalyptic number.

It is an amenable number.

64278380 is an abundant number, since it is smaller than the sum of its proper divisors (71032180).

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

64278380 is a wasteful number, since it uses less digits than its factorization.

64278380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7769 (or 7767 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 64278380 is about 8017.3798712547. The cubic root of 64278380 is about 400.5791194803.

The spelling of 64278380 in words is "sixty-four million, two hundred seventy-eight thousand, three hundred eighty".