78247713 has 16 divisors (see below), whose sum is σ = 108158400. Its totient is φ = 50258880.

The previous prime is 78247699. The next prime is 78247717. The reversal of 78247713 is 31774287.

It is not a de Polignac number, because 78247713 - 2¹⁷ = 78116641 is a prime.

It is a super-2 number, since 2×78247713² = 12245409179460738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78247717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70003 + ... + 71111.

It is an arithmetic number, because the mean of its divisors is an integer number (6759900).

Almost surely, 2^78247713 is an apocalyptic number.

It is an amenable number.

78247713 is a deficient number, since it is larger than the sum of its proper divisors (29910687).

78247713 is a wasteful number, since it uses less digits than its factorization.

78247713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952.

The product of its digits is 65856, while the sum is 39.

The square root of 78247713 is about 8845.7737366496. The cubic root of 78247713 is about 427.7176949454.

The spelling of 78247713 in words is "seventy-eight million, two hundred forty-seven thousand, seven hundred thirteen".