78794890 has 8 divisors (see below), whose sum is σ = 141830820. Its totient is φ = 31517952.

The previous prime is 78794887. The next prime is 78794893. The reversal of 78794890 is 9849787.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78794887) and next prime (78794893).

It can be written as a sum of positive squares in 2 ways, for example, as 75672601 + 3122289 = 8699^2 + 1767^2 .

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

It is a super-2 number, since 2×78794890² = 12417269380224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78794893) 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, 3939735 + ... + 3939754.

Almost surely, 2^78794890 is an apocalyptic number.

78794890 is a deficient number, since it is larger than the sum of its proper divisors (63035930).

78794890 is a wasteful number, since it uses less digits than its factorization.

78794890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7879496.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 78794890 is about 8876.6485792781. The cubic root of 78794890 is about 428.7123730604.

It can be divided in two parts, 7879 and 4890, that added together give a square (12769 = 113²).

The spelling of 78794890 in words is "seventy-eight million, seven hundred ninety-four thousand, eight hundred ninety".