78402117 has 8 divisors (see below), whose sum is σ = 105005824. Its totient is φ = 52033248.

The previous prime is 78402097. The next prime is 78402119. The reversal of 78402117 is 71120487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-78402117 is a prime.

It is a super-2 number, since 2×78402117² = 12293783900163378, 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 (78402119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57928 + ... + 59265.

It is an arithmetic number, because the mean of its divisors is an integer number (13125728).

Almost surely, 2^78402117 is an apocalyptic number.

It is an amenable number.

78402117 is a deficient number, since it is larger than the sum of its proper divisors (26603707).

78402117 is a wasteful number, since it uses less digits than its factorization.

78402117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117419.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 78402117 is about 8854.4969930539. The cubic root of 78402117 is about 427.9988445102.

The spelling of 78402117 in words is "seventy-eight million, four hundred two thousand, one hundred seventeen".