78157087 has 4 divisors (see below), whose sum is σ = 78562240. Its totient is φ = 77751936.

The previous prime is 78157073. The next prime is 78157091. The reversal of 78157087 is 78075187.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78157087 is a prime.

It is a super-2 number, since 2×78157087² = 12217060496651138, 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 (78157487) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 202287 + ... + 202672.

It is an arithmetic number, because the mean of its divisors is an integer number (19640560).

Almost surely, 2^78157087 is an apocalyptic number.

78157087 is a deficient number, since it is larger than the sum of its proper divisors (405153).

78157087 is a wasteful number, since it uses less digits than its factorization.

78157087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405152.

The product of its (nonzero) digits is 109760, while the sum is 43.

The square root of 78157087 is about 8840.6496933201. The cubic root of 78157087 is about 427.5525045233.

The spelling of 78157087 in words is "seventy-eight million, one hundred fifty-seven thousand, eighty-seven".