64978033 has 4 divisors (see below), whose sum is σ = 65056320. Its totient is φ = 64899748.

The previous prime is 64978027. The next prime is 64978037. The reversal of 64978033 is 33087946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64978033 - 2¹³ = 64969841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64978037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37885 + ... + 39562.

It is an arithmetic number, because the mean of its divisors is an integer number (16264080).

Almost surely, 2^64978033 is an apocalyptic number.

It is an amenable number.

64978033 is a deficient number, since it is larger than the sum of its proper divisors (78287).

64978033 is an equidigital number, since it uses as much as digits as its factorization.

64978033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78286.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 64978033 is about 8060.8952976701. The cubic root of 64978033 is about 402.0272767644.

The spelling of 64978033 in words is "sixty-four million, nine hundred seventy-eight thousand, thirty-three".