78187506 has 16 divisors (see below), whose sum is σ = 157894464. Its totient is φ = 25809264.

The previous prime is 78187493. The next prime is 78187507. The reversal of 78187506 is 60578187.

It is a super-2 number, since 2×78187506² = 12226572189000072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78187507) 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 7 ways as a sum of consecutive naturals, for example, 62641 + ... + 63876.

It is an arithmetic number, because the mean of its divisors is an integer number (9868404).

Almost surely, 2^78187506 is an apocalyptic number.

78187506 is an abundant number, since it is smaller than the sum of its proper divisors (79706958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78187506 is a wasteful number, since it uses less digits than its factorization.

78187506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126625.

The product of its (nonzero) digits is 94080, while the sum is 42.

The square root of 78187506 is about 8842.3699311893. The cubic root of 78187506 is about 427.6079656176.

The spelling of 78187506 in words is "seventy-eight million, one hundred eighty-seven thousand, five hundred six".