78663726 has 48 divisors (see below), whose sum is σ = 188326944. Its totient is φ = 23603712.

The previous prime is 78663719. The next prime is 78663731. The reversal of 78663726 is 62736687.

78663726 is a `hidden beast` number, since 7 + 8 + 6 + 637 + 2 + 6 = 666.

It is a super-4 number, since 4×78663726⁴ (a number of 33 digits) contains 4444 as substring.

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, 1450 + ... + 12626.

It is an arithmetic number, because the mean of its divisors is an integer number (3923478).

Almost surely, 2^78663726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78663726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94163472).

78663726 is an abundant number, since it is smaller than the sum of its proper divisors (109663218).

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

78663726 is a wasteful number, since it uses less digits than its factorization.

78663726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11225 (or 11222 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 78663726 is about 8869.2573533526. The cubic root of 78663726 is about 428.4743590635.

The spelling of 78663726 in words is "seventy-eight million, six hundred sixty-three thousand, seven hundred twenty-six".