78448311 has 16 divisors (see below), whose sum is σ = 118694400. Its totient is φ = 51185304.

The previous prime is 78448309. The next prime is 78448313. The reversal of 78448311 is 11384487.

It is an interprime number because it is at equal distance from previous prime (78448309) and next prime (78448313).

It is not a de Polignac number, because 78448311 - 2¹ = 78448309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78448313) 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, 29641 + ... + 32178.

It is an arithmetic number, because the mean of its divisors is an integer number (7418400).

Almost surely, 2^78448311 is an apocalyptic number.

78448311 is a deficient number, since it is larger than the sum of its proper divisors (40246089).

78448311 is a wasteful number, since it uses less digits than its factorization.

78448311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61875 (or 61869 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 78448311 is about 8857.1051139749. The cubic root of 78448311 is about 428.0828860203.

The spelling of 78448311 in words is "seventy-eight million, four hundred forty-eight thousand, three hundred eleven".