7900078 has 4 divisors (see below), whose sum is σ = 11850120. Its totient is φ = 3950038.

The previous prime is 7900073. The next prime is 7900091. The reversal of 7900078 is 8700097.

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

It is a super-2 number, since 2×7900078² = 124822464812168, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7900073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1975018 + ... + 1975021.

It is an arithmetic number, because the mean of its divisors is an integer number (2962530).

Almost surely, 2^7900078 is an apocalyptic number.

7900078 is a deficient number, since it is larger than the sum of its proper divisors (3950042).

7900078 is a wasteful number, since it uses less digits than its factorization.

7900078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3950041.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 7900078 is about 2810.7077400541. The cubic root of 7900078 is about 199.1638256006.

The spelling of 7900078 in words is "seven million, nine hundred thousand, seventy-eight".