78564380 has 24 divisors (see below), whose sum is σ = 166450032. Its totient is φ = 31146752.

The previous prime is 78564379. The next prime is 78564413. The reversal of 78564380 is 8346587.

78564380 = T₂₁₉ + T₂₂₀ + ... + T₇₈₃.

It is a happy number.

It is a super-3 number, since 3×78564380³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15122 + ... + 19641.

It is an arithmetic number, because the mean of its divisors is an integer number (6935418).

Almost surely, 2^78564380 is an apocalyptic number.

It is an amenable number.

78564380 is an abundant number, since it is smaller than the sum of its proper divisors (87885652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78564380 is a wasteful number, since it uses less digits than its factorization.

78564380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34885 (or 34883 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 78564380 is about 8863.6550023114. The cubic root of 78564380 is about 428.2939067844.

The spelling of 78564380 in words is "seventy-eight million, five hundred sixty-four thousand, three hundred eighty".