78978429 has 8 divisors (see below), whose sum is σ = 117005120. Its totient is φ = 52652268.

The previous prime is 78978409. The next prime is 78978437. The reversal of 78978429 is 92487987.

It is not a de Polignac number, because 78978429 - 2⁷ = 78978301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78978409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462537 + ... + 1462590.

It is an arithmetic number, because the mean of its divisors is an integer number (14625640).

Almost surely, 2^78978429 is an apocalyptic number.

It is an amenable number.

78978429 is a deficient number, since it is larger than the sum of its proper divisors (38026691).

78978429 is a wasteful number, since it uses less digits than its factorization.

78978429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925136 (or 2925130 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 78978429 is about 8886.9808709145. The cubic root of 78978429 is about 429.0449852577.

The spelling of 78978429 in words is "seventy-eight million, nine hundred seventy-eight thousand, four hundred twenty-nine".