78187151 has 8 divisors (see below), whose sum is σ = 89410464. Its totient is φ = 66977280.

The previous prime is 78187129. The next prime is 78187157. The reversal of 78187151 is 15178187.

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 78187151 - 2¹⁰ = 78186127 is a prime.

It is a super-2 number, since 2×78187151² = 12226461162993602, 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 (78187157) 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, 19451 + ... + 23123.

It is an arithmetic number, because the mean of its divisors is an integer number (11176308).

Almost surely, 2^78187151 is an apocalyptic number.

78187151 is a deficient number, since it is larger than the sum of its proper divisors (11223313).

78187151 is a wasteful number, since it uses less digits than its factorization.

78187151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6721.

The product of its digits is 15680, while the sum is 38.

The square root of 78187151 is about 8842.3498573626. The cubic root of 78187151 is about 427.6073184508.

The spelling of 78187151 in words is "seventy-eight million, one hundred eighty-seven thousand, one hundred fifty-one".