78211064 has 16 divisors (see below), whose sum is σ = 148294800. Its totient is φ = 38665792.

The previous prime is 78211039. The next prime is 78211069. The reversal of 78211064 is 46011287.

It is a super-2 number, since 2×78211064² = 12233941064024192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78211069) 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, 54212 + ... + 55635.

It is an arithmetic number, because the mean of its divisors is an integer number (9268425).

Almost surely, 2^78211064 is an apocalyptic number.

It is an amenable number.

78211064 is a deficient number, since it is larger than the sum of its proper divisors (70083736).

78211064 is a wasteful number, since it uses less digits than its factorization.

78211064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109942 (or 109938 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 78211064 is about 8843.7019397987. The cubic root of 78211064 is about 427.6509075888.

The spelling of 78211064 in words is "seventy-eight million, two hundred eleven thousand, sixty-four".