78340799 has 4 divisors (see below), whose sum is σ = 79073064. Its totient is φ = 77608536.

The previous prime is 78340771. The next prime is 78340853. The reversal of 78340799 is 99704387.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78340799 is a prime.

It is a super-2 number, since 2×78340799² = 12274561575916802, 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 (78340739) 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, 365972 + ... + 366185.

It is an arithmetic number, because the mean of its divisors is an integer number (19768266).

Almost surely, 2^78340799 is an apocalyptic number.

78340799 is a deficient number, since it is larger than the sum of its proper divisors (732265).

78340799 is a wasteful number, since it uses less digits than its factorization.

78340799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732264.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 78340799 is about 8851.0337814292. The cubic root of 78340799 is about 427.8872366485.

The spelling of 78340799 in words is "seventy-eight million, three hundred forty thousand, seven hundred ninety-nine".