78681730 has 16 divisors (see below), whose sum is σ = 142498944. Its totient is φ = 31278960.

The previous prime is 78681697. The next prime is 78681737. The reversal of 78681730 is 3718687.

It is not an unprimeable number, because it can be changed into a prime (78681737) 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, 22506 + ... + 25765.

It is an arithmetic number, because the mean of its divisors is an integer number (8906184).

Almost surely, 2^78681730 is an apocalyptic number.

78681730 is a deficient number, since it is larger than the sum of its proper divisors (63817214).

78681730 is a wasteful number, since it uses less digits than its factorization.

78681730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48441.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 78681730 is about 8870.2722618869. The cubic root of 78681730 is about 428.5070453019.

The spelling of 78681730 in words is "seventy-eight million, six hundred eighty-one thousand, seven hundred thirty".