78953869 has 4 divisors (see below), whose sum is σ = 81500800. Its totient is φ = 76406940.

The previous prime is 78953867. The next prime is 78953923. The reversal of 78953869 is 96835987.

It is a happy number.

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 not a de Polignac number, because 78953869 - 2¹ = 78953867 is a prime.

It is a super-2 number, since 2×78953869² = 12467426860138322, 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 (78953867) 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, 1273419 + ... + 1273480.

It is an arithmetic number, because the mean of its divisors is an integer number (20375200).

Almost surely, 2^78953869 is an apocalyptic number.

It is an amenable number.

78953869 is a deficient number, since it is larger than the sum of its proper divisors (2546931).

78953869 is a wasteful number, since it uses less digits than its factorization.

78953869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546930.

The product of its digits is 3265920, while the sum is 55.

The square root of 78953869 is about 8885.5989668677. The cubic root of 78953869 is about 429.0005071328. Note that the first 3 decimals are identical.

The spelling of 78953869 in words is "seventy-eight million, nine hundred fifty-three thousand, eight hundred sixty-nine".