64978071 has 16 divisors (see below), whose sum is σ = 88996320. Its totient is φ = 42145280.

The previous prime is 64978049. The next prime is 64978079. The reversal of 64978071 is 17087946.

It is a cyclic number.

It is not a de Polignac number, because 64978071 - 2⁷ = 64977943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64978079) 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 15 ways as a sum of consecutive naturals, for example, 79915 + ... + 80723.

It is an arithmetic number, because the mean of its divisors is an integer number (5562270).

Almost surely, 2^64978071 is an apocalyptic number.

64978071 is a deficient number, since it is larger than the sum of its proper divisors (24018249).

64978071 is a wasteful number, since it uses less digits than its factorization.

64978071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 64978071 is about 8060.8976547280. The cubic root of 64978071 is about 402.0273551346.

The spelling of 64978071 in words is "sixty-four million, nine hundred seventy-eight thousand, seventy-one".