78073429 has 4 divisors (see below), whose sum is σ = 89226784. Its totient is φ = 66920076.

The previous prime is 78073417. The next prime is 78073433. The reversal of 78073429 is 92437087.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92437087 = 6131 ⋅15077.

It is a cyclic number.

It is not a de Polignac number, because 78073429 - 2⁵ = 78073397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78073391 and 78073400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78073459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5576667 + ... + 5576680.

It is an arithmetic number, because the mean of its divisors is an integer number (22306696).

Almost surely, 2^78073429 is an apocalyptic number.

It is an amenable number.

78073429 is a deficient number, since it is larger than the sum of its proper divisors (11153355).

78073429 is a wasteful number, since it uses less digits than its factorization.

78073429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11153354.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 78073429 is about 8835.9169869346. The cubic root of 78073429 is about 427.3999017832.

It can be divided in two parts, 7807 and 3429, that added together give a square (11236 = 106²).

The spelling of 78073429 in words is "seventy-eight million, seventy-three thousand, four hundred twenty-nine".