78890351 has 4 divisors (see below), whose sum is σ = 79627752. Its totient is φ = 78152952.

The previous prime is 78890347. The next prime is 78890363. The reversal of 78890351 is 15309887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15309887 = 137 ⋅111751.

It is a cyclic number.

It is not a de Polignac number, because 78890351 - 2² = 78890347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78890299 and 78890308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78890321) 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, 368540 + ... + 368753.

It is an arithmetic number, because the mean of its divisors is an integer number (19906938).

Almost surely, 2^78890351 is an apocalyptic number.

78890351 is a deficient number, since it is larger than the sum of its proper divisors (737401).

78890351 is a wasteful number, since it uses less digits than its factorization.

78890351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737400.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 78890351 is about 8882.0240373464. The cubic root of 78890351 is about 428.8854333345.

The spelling of 78890351 in words is "seventy-eight million, eight hundred ninety thousand, three hundred fifty-one".