64978745 has 16 divisors (see below), whose sum is σ = 84188160. Its totient is φ = 47861184.

The previous prime is 64978733. The next prime is 64978757. The reversal of 64978745 is 54787946.

It is an interprime number because it is at equal distance from previous prime (64978733) and next prime (64978757).

It is a cyclic number.

It is not a de Polignac number, because 64978745 - 2⁶ = 64978681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64978693 and 64978702.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30092 + ... + 32178.

It is an arithmetic number, because the mean of its divisors is an integer number (5261760).

Almost surely, 2^64978745 is an apocalyptic number.

64978745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64978745 is a deficient number, since it is larger than the sum of its proper divisors (19209415).

64978745 is a wasteful number, since it uses less digits than its factorization.

64978745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584.

The product of its digits is 1693440, while the sum is 50.

The square root of 64978745 is about 8060.9394613779. The cubic root of 64978745 is about 402.0287451702.

The spelling of 64978745 in words is "sixty-four million, nine hundred seventy-eight thousand, seven hundred forty-five".