78561476 has 48 divisors (see below), whose sum is σ = 161554176. Its totient is φ = 32732544.

The previous prime is 78561463. The next prime is 78561481. The reversal of 78561476 is 67416587.

It is a super-2 number, since 2×78561476² = 12343811022597152, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

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 15 ways as a sum of consecutive naturals, for example, 247670 + ... + 247986.

It is an arithmetic number, because the mean of its divisors is an integer number (3365712).

Almost surely, 2^78561476 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78561476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80777088).

78561476 is an abundant number, since it is smaller than the sum of its proper divisors (82992700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78561476 is a wasteful number, since it uses less digits than its factorization.

78561476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 546 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The square root of 78561476 is about 8863.4911857574. The cubic root of 78561476 is about 428.2886296650.

The spelling of 78561476 in words is "seventy-eight million, five hundred sixty-one thousand, four hundred seventy-six".