78342887 has 8 divisors (see below), whose sum is σ = 89613696. Its totient is φ = 67091832.

The previous prime is 78342881. The next prime is 78342889. The reversal of 78342887 is 78824387.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78342887 - 2¹⁴ = 78326503 is a prime.

It is a super-2 number, since 2×78342887² = 12275215886989538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78342881) 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, 4868 + ... + 13430.

It is an arithmetic number, because the mean of its divisors is an integer number (11201712).

Almost surely, 2^78342887 is an apocalyptic number.

78342887 is a deficient number, since it is larger than the sum of its proper divisors (11270809).

78342887 is a wasteful number, since it uses less digits than its factorization.

78342887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9877.

The product of its digits is 602112, while the sum is 47.

The square root of 78342887 is about 8851.1517329667. The cubic root of 78342887 is about 427.8910380760.

The spelling of 78342887 in words is "seventy-eight million, three hundred forty-two thousand, eight hundred eighty-seven".