78770066 has 16 divisors (see below), whose sum is σ = 122568864. Its totient is φ = 37939104.

The previous prime is 78770063. The next prime is 78770089. The reversal of 78770066 is 66007787.

It is not an unprimeable number, because it can be changed into a prime (78770063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5 + ... + 12551.

It is an arithmetic number, because the mean of its divisors is an integer number (7660554).

Almost surely, 2^78770066 is an apocalyptic number.

78770066 is a deficient number, since it is larger than the sum of its proper divisors (43798798).

78770066 is a wasteful number, since it uses less digits than its factorization.

78770066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12665.

The product of its (nonzero) digits is 98784, while the sum is 41.

The square root of 78770066 is about 8875.2501936565. The cubic root of 78770066 is about 428.6673469860.

The spelling of 78770066 in words is "seventy-eight million, seven hundred seventy thousand, sixty-six".