78420769 has 8 divisors (see below), whose sum is σ = 91531008. Its totient is φ = 65787360.

The previous prime is 78420751. The next prime is 78420781. The reversal of 78420769 is 96702487.

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

It is a cyclic number.

It is not a de Polignac number, because 78420769 - 2⁵ = 78420737 is a prime.

It is a super-2 number, since 2×78420769² = 12299634021102722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78420709) 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, 118852 + ... + 119509.

It is an arithmetic number, because the mean of its divisors is an integer number (11441376).

Almost surely, 2^78420769 is an apocalyptic number.

It is an amenable number.

78420769 is a deficient number, since it is larger than the sum of its proper divisors (13110239).

78420769 is a wasteful number, since it uses less digits than its factorization.

78420769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238415.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 78420769 is about 8855.5501805365. The cubic root of 78420769 is about 428.0327823756.

The spelling of 78420769 in words is "seventy-eight million, four hundred twenty thousand, seven hundred sixty-nine".