78389049 has 16 divisors (see below), whose sum is σ = 108633600. Its totient is φ = 50225280.

The previous prime is 78389039. The next prime is 78389053. The reversal of 78389049 is 94098387.

It is not a de Polignac number, because 78389049 - 2⁴ = 78389033 is a prime.

It is a super-2 number, since 2×78389049² = 12289686006248802, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78388989 and 78389007.

It is not an unprimeable number, because it can be changed into a prime (78389009) 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, 11029 + ... + 16685.

It is an arithmetic number, because the mean of its divisors is an integer number (6789600).

Almost surely, 2^78389049 is an apocalyptic number.

It is an amenable number.

78389049 is a deficient number, since it is larger than the sum of its proper divisors (30244551).

78389049 is a wasteful number, since it uses less digits than its factorization.

78389049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5840.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 78389049 is about 8853.7590321851. The cubic root of 78389049 is about 427.9750636912.

The spelling of 78389049 in words is "seventy-eight million, three hundred eighty-nine thousand, forty-nine".