78953665 has 16 divisors (see below), whose sum is σ = 109243008. Its totient is φ = 53657856.

The previous prime is 78953663. The next prime is 78953669. The reversal of 78953665 is 56635987.

It is not a de Polignac number, because 78953665 - 2¹ = 78953663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78953663) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6027 + ... + 13936.

It is an arithmetic number, because the mean of its divisors is an integer number (6827688).

Almost surely, 2^78953665 is an apocalyptic number.

It is an amenable number.

78953665 is a deficient number, since it is larger than the sum of its proper divisors (30289343).

78953665 is a wasteful number, since it uses less digits than its factorization.

78953665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20088.

The product of its digits is 1360800, while the sum is 49.

The square root of 78953665 is about 8885.5874876116. The cubic root of 78953665 is about 429.0001376504. Note that the first 3 decimals are identical.

The spelling of 78953665 in words is "seventy-eight million, nine hundred fifty-three thousand, six hundred sixty-five".