78274885 has 24 divisors (see below), whose sum is σ = 107713800. Its totient is φ = 54392832.

The previous prime is 78274879. The next prime is 78274901. The reversal of 78274885 is 58847287.

It can be written as a sum of positive squares in 12 ways, for example, as 50722884 + 27552001 = 7122^2 + 5249^2 .

It is not a de Polignac number, because 78274885 - 2¹³ = 78266693 is a prime.

It is a super-2 number, since 2×78274885² = 12253915243526450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 11641 + ... + 17089.

It is an arithmetic number, because the mean of its divisors is an integer number (4488075).

Almost surely, 2^78274885 is an apocalyptic number.

It is an amenable number.

78274885 is a deficient number, since it is larger than the sum of its proper divisors (29438915).

78274885 is a wasteful number, since it uses less digits than its factorization.

78274885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5497 (or 5484 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 49.

The square root of 78274885 is about 8847.3094780278. The cubic root of 78274885 is about 427.7671984165.

The spelling of 78274885 in words is "seventy-eight million, two hundred seventy-four thousand, eight hundred eighty-five".