78730665 has 32 divisors (see below), whose sum is σ = 136273536. Its totient is φ = 38584320.

The previous prime is 78730657. The next prime is 78730697. The reversal of 78730665 is 56603787.

It is not a de Polignac number, because 78730665 - 2³ = 78730657 is a prime.

It is a super-2 number, since 2×78730665² = 12397035222684450, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 49330 + ... + 50900.

It is an arithmetic number, because the mean of its divisors is an integer number (4258548).

Almost surely, 2^78730665 is an apocalyptic number.

It is an amenable number.

78730665 is a deficient number, since it is larger than the sum of its proper divisors (57542871).

78730665 is a wasteful number, since it uses less digits than its factorization.

78730665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 78730665 is about 8873.0302039382. The cubic root of 78730665 is about 428.5958615436.

The spelling of 78730665 in words is "seventy-eight million, seven hundred thirty thousand, six hundred sixty-five".