78748521 has 8 divisors (see below), whose sum is σ = 110524320. Its totient is φ = 49735872.

The previous prime is 78748507. The next prime is 78748529. The reversal of 78748521 is 12584787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78748521 - 2⁷ = 78748393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78748529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690720 + ... + 690833.

It is an arithmetic number, because the mean of its divisors is an integer number (13815540).

Almost surely, 2^78748521 is an apocalyptic number.

It is an amenable number.

78748521 is a deficient number, since it is larger than the sum of its proper divisors (31775799).

78748521 is a wasteful number, since it uses less digits than its factorization.

78748521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381575.

The product of its digits is 125440, while the sum is 42.

The square root of 78748521 is about 8874.0363420486. The cubic root of 78748521 is about 428.6282607331.

The spelling of 78748521 in words is "seventy-eight million, seven hundred forty-eight thousand, five hundred twenty-one".