78147949 has 4 divisors (see below), whose sum is σ = 85252320. Its totient is φ = 71043580.

The previous prime is 78147947. The next prime is 78147977. The reversal of 78147949 is 94974187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78147949 - 2¹ = 78147947 is a prime.

It is a super-2 number, since 2×78147949² = 12214203865813202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78147947) 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 3 ways as a sum of consecutive naturals, for example, 3552169 + ... + 3552190.

It is an arithmetic number, because the mean of its divisors is an integer number (21313080).

Almost surely, 2^78147949 is an apocalyptic number.

It is an amenable number.

78147949 is a deficient number, since it is larger than the sum of its proper divisors (7104371).

78147949 is a wasteful number, since it uses less digits than its factorization.

78147949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104370.

The product of its digits is 508032, while the sum is 49.

The square root of 78147949 is about 8840.1328609925. The cubic root of 78147949 is about 427.5358409584.

The spelling of 78147949 in words is "seventy-eight million, one hundred forty-seven thousand, nine hundred forty-nine".