64147878 has 24 divisors (see below), whose sum is σ = 140664888. Its totient is φ = 21124512.

The previous prime is 64147871. The next prime is 64147883. The reversal of 64147878 is 87874146.

It is a super-2 number, since 2×64147878² = 8229900503805768, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64147871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19975 + ... + 22962.

It is an arithmetic number, because the mean of its divisors is an integer number (5861037).

Almost surely, 2^64147878 is an apocalyptic number.

64147878 is an abundant number, since it is smaller than the sum of its proper divisors (76517010).

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

64147878 is a wasteful number, since it uses less digits than its factorization.

64147878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43028 (or 43025 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 64147878 is about 8009.2370423156. The cubic root of 64147878 is about 400.3078421889.

It can be divided in two parts, 64147 and 878, that added together give a square (65025 = 255²).

The spelling of 64147878 in words is "sixty-four million, one hundred forty-seven thousand, eight hundred seventy-eight".