78721748 has 24 divisors (see below), whose sum is σ = 160417152. Its totient is φ = 33100704.

The previous prime is 78721739. The next prime is 78721751. The reversal of 78721748 is 84712787.

It is a super-2 number, since 2×78721748² = 12394227216351008, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78721699 and 78721708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25040 + ... + 28007.

It is an arithmetic number, because the mean of its divisors is an integer number (6684048).

Almost surely, 2^78721748 is an apocalyptic number.

It is an amenable number.

78721748 is an abundant number, since it is smaller than the sum of its proper divisors (81695404).

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

78721748 is a wasteful number, since it uses less digits than its factorization.

78721748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53111 (or 53109 counting only the distinct ones).

The product of its digits is 175616, while the sum is 44.

The square root of 78721748 is about 8872.5277119883. The cubic root of 78721748 is about 428.5796800739.

The spelling of 78721748 in words is "seventy-eight million, seven hundred twenty-one thousand, seven hundred forty-eight".