78503634 has 64 divisors (see below), whose sum is σ = 191393280. Its totient is φ = 23654160.

The previous prime is 78503617. The next prime is 78503639. The reversal of 78503634 is 43630587.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (78503639) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167869 + ... + 168335.

It is an arithmetic number, because the mean of its divisors is an integer number (2990520).

Almost surely, 2^78503634 is an apocalyptic number.

78503634 is the 5604-th heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78503634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95696640).

78503634 is an abundant number, since it is smaller than the sum of its proper divisors (112889646).

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

78503634 is a wasteful number, since it uses less digits than its factorization.

78503634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 78503634 is about 8860.2276494456. The cubic root of 78503634 is about 428.1834926670.

The spelling of 78503634 in words is "seventy-eight million, five hundred three thousand, six hundred thirty-four".