78366975 has 12 divisors (see below), whose sum is σ = 129566856. Its totient is φ = 41795680.

The previous prime is 78366971. The next prime is 78367013. The reversal of 78366975 is 57966387.

It is not a de Polignac number, because 78366975 - 2² = 78366971 is a prime.

It is a super-2 number, since 2×78366975² = 12282765541301250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78366971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522372 + ... + 522521.

It is an arithmetic number, because the mean of its divisors is an integer number (10797238).

Almost surely, 2^78366975 is an apocalyptic number.

78366975 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78366975 is a deficient number, since it is larger than the sum of its proper divisors (51199881).

78366975 is a wasteful number, since it uses less digits than its factorization.

78366975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044906 (or 1044901 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 51.

The square root of 78366975 is about 8852.5123552583. The cubic root of 78366975 is about 427.9348879754.

The spelling of 78366975 in words is "seventy-eight million, three hundred sixty-six thousand, nine hundred seventy-five".