64378751 has 4 divisors (see below), whose sum is σ = 64400400. Its totient is φ = 64357104.

The previous prime is 64378747. The next prime is 64378799. The reversal of 64378751 is 15787346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15787346 = 2 ⋅7893673.

It is a cyclic number.

It is not a de Polignac number, because 64378751 - 2² = 64378747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64378699 and 64378708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64378151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5486 + ... + 12603.

It is an arithmetic number, because the mean of its divisors is an integer number (16100100).

Almost surely, 2^64378751 is an apocalyptic number.

64378751 is a deficient number, since it is larger than the sum of its proper divisors (21649).

64378751 is a wasteful number, since it uses less digits than its factorization.

64378751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21648.

The product of its digits is 141120, while the sum is 41.

The square root of 64378751 is about 8023.6370182106. The cubic root of 64378751 is about 400.7875131235.

The spelling of 64378751 in words is "sixty-four million, three hundred seventy-eight thousand, seven hundred fifty-one".