78261850 has 24 divisors (see below), whose sum is σ = 146240640. Its totient is φ = 31159920.

The previous prime is 78261839. The next prime is 78261857. The reversal of 78261850 is 5816287.

It is a super-2 number, since 2×78261850² = 12249834330845000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78261857) 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 11 ways as a sum of consecutive naturals, for example, 7641 + ... + 14659.

It is an arithmetic number, because the mean of its divisors is an integer number (6093360).

Almost surely, 2^78261850 is an apocalyptic number.

78261850 is a deficient number, since it is larger than the sum of its proper divisors (67978790).

78261850 is a wasteful number, since it uses less digits than its factorization.

78261850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7254 (or 7249 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 78261850 is about 8846.5727827221. The cubic root of 78261850 is about 427.7434519536.

The spelling of 78261850 in words is "seventy-eight million, two hundred sixty-one thousand, eight hundred fifty".