64378942 has 4 divisors (see below), whose sum is σ = 96568416. Its totient is φ = 32189470.

The previous prime is 64378939. The next prime is 64378943. The reversal of 64378942 is 24987346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24987346 = 2 ⋅12493673.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64378943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16094734 + ... + 16094737.

It is an arithmetic number, because the mean of its divisors is an integer number (24142104).

Almost surely, 2^64378942 is an apocalyptic number.

64378942 is a deficient number, since it is larger than the sum of its proper divisors (32189474).

64378942 is a wasteful number, since it uses less digits than its factorization.

64378942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32189473.

The product of its digits is 290304, while the sum is 43.

The square root of 64378942 is about 8023.6489205348. The cubic root of 64378942 is about 400.7879094776.

The spelling of 64378942 in words is "sixty-four million, three hundred seventy-eight thousand, nine hundred forty-two".