78246155 has 32 divisors (see below), whose sum is σ = 107956800. Its totient is φ = 54253056.

The previous prime is 78246143. The next prime is 78246173. The reversal of 78246155 is 55164287.

It is not a de Polignac number, because 78246155 - 2²⁰ = 77197579 is a prime.

It is a super-2 number, since 2×78246155² = 12244921544568050, which contains 22 as substring.

Its product of digits (67200) is a multiple of the sum of its prime factors (480).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 186536 + ... + 186954.

It is an arithmetic number, because the mean of its divisors is an integer number (3373650).

Almost surely, 2^78246155 is an apocalyptic number.

78246155 is a deficient number, since it is larger than the sum of its proper divisors (29710645).

78246155 is a wasteful number, since it uses less digits than its factorization.

78246155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 454 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The square root of 78246155 is about 8845.6856715576. The cubic root of 78246155 is about 427.7148561464.

The spelling of 78246155 in words is "seventy-eight million, two hundred forty-six thousand, one hundred fifty-five".