78072566 has 16 divisors (see below), whose sum is σ = 137582928. Its totient is φ = 32757600.

The previous prime is 78072541. The next prime is 78072607. The reversal of 78072566 is 66527087.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136205 + ... + 136776.

It is an arithmetic number, because the mean of its divisors is an integer number (8598933).

Almost surely, 2^78072566 is an apocalyptic number.

78072566 is a deficient number, since it is larger than the sum of its proper divisors (59510362).

78072566 is a wasteful number, since it uses less digits than its factorization.

78072566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273007.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 78072566 is about 8835.8681520267. The cubic root of 78072566 is about 427.3983269944.

The spelling of 78072566 in words is "seventy-eight million, seventy-two thousand, five hundred sixty-six".