78761436 has 72 divisors (see below), whose sum is σ = 202172544. Its totient is φ = 23849280.

The previous prime is 78761387. The next prime is 78761461. The reversal of 78761436 is 63416787.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143715 + ... + 144261.

It is an arithmetic number, because the mean of its divisors is an integer number (2807952).

Almost surely, 2^78761436 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 78761436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101086272).

78761436 is an abundant number, since it is smaller than the sum of its proper divisors (123411108).

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

78761436 is a wasteful number, since it uses less digits than its factorization.

78761436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 636 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 78761436 is about 8874.7639968621. The cubic root of 78761436 is about 428.6516915706.

It can be divided in two parts, 78761 and 436, that added together give a palindrome (79197).

The spelling of 78761436 in words is "seventy-eight million, seven hundred sixty-one thousand, four hundred thirty-six".