78449577 has 8 divisors (see below), whose sum is σ = 110752416. Its totient is φ = 49223232.

The previous prime is 78449531. The next prime is 78449633. The reversal of 78449577 is 77594487.

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

It is not a de Polignac number, because 78449577 - 2⁶ = 78449513 is a prime.

It is a super-2 number, since 2×78449577² = 12308672262957858, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 1538227 = 78449577 / (7 + 8 + 4 + 4 + 9 + 5 + 7 + 7).

It is not an unprimeable number, because it can be changed into a prime (78449177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769063 + ... + 769164.

It is an arithmetic number, because the mean of its divisors is an integer number (13844052).

Almost surely, 2^78449577 is an apocalyptic number.

It is an amenable number.

78449577 is a deficient number, since it is larger than the sum of its proper divisors (32302839).

78449577 is a wasteful number, since it uses less digits than its factorization.

78449577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538247.

The product of its digits is 1975680, while the sum is 51.

The square root of 78449577 is about 8857.1765817330. The cubic root of 78449577 is about 428.0851888106.

The spelling of 78449577 in words is "seventy-eight million, four hundred forty-nine thousand, five hundred seventy-seven".