78389674 has 8 divisors (see below), whose sum is σ = 128274048. Its totient is φ = 35631660.

The previous prime is 78389671. The next prime is 78389711. The reversal of 78389674 is 47698387.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78389674² = 12289881979652552, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78389671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1781562 + ... + 1781605.

It is an arithmetic number, because the mean of its divisors is an integer number (16034256).

Almost surely, 2^78389674 is an apocalyptic number.

78389674 is a deficient number, since it is larger than the sum of its proper divisors (49884374).

78389674 is a wasteful number, since it uses less digits than its factorization.

78389674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3563180.

The product of its digits is 2032128, while the sum is 52.

The square root of 78389674 is about 8853.7943278574. The cubic root of 78389674 is about 427.9762011107.

The spelling of 78389674 in words is "seventy-eight million, three hundred eighty-nine thousand, six hundred seventy-four".