78151673 has 4 divisors (see below), whose sum is σ = 78548580. Its totient is φ = 77754768.

The previous prime is 78151649. The next prime is 78151709. The reversal of 78151673 is 37615187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75203584 + 2948089 = 8672^2 + 1717^2 .

It is a cyclic number.

It is not a de Polignac number, because 78151673 - 2¹² = 78147577 is a prime.

It is a super-2 number, since 2×78151673² = 12215367985397858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78151643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198158 + ... + 198551.

It is an arithmetic number, because the mean of its divisors is an integer number (19637145).

Almost surely, 2^78151673 is an apocalyptic number.

It is an amenable number.

78151673 is a deficient number, since it is larger than the sum of its proper divisors (396907).

78151673 is a wasteful number, since it uses less digits than its factorization.

78151673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396906.

The product of its digits is 35280, while the sum is 38.

The square root of 78151673 is about 8840.3434888018. The cubic root of 78151673 is about 427.5426320012.

The spelling of 78151673 in words is "seventy-eight million, one hundred fifty-one thousand, six hundred seventy-three".