7378678121 has 8 divisors (see below), whose sum is σ = 7605080904. Its totient is φ = 7153695360.

The previous prime is 7378678103. The next prime is 7378678123. The reversal of 7378678121 is 1218768737.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5682144400 + 1696533721 = 75380^2 + 41189^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7378678121 - 2⁶ = 7378678057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7378678121.

It is not an unprimeable number, because it can be changed into a prime (7378678123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344450 + ... + 365243.

It is an arithmetic number, because the mean of its divisors is an integer number (950635113).

Almost surely, 2^7378678121 is an apocalyptic number.

It is an amenable number.

7378678121 is a deficient number, since it is larger than the sum of its proper divisors (226402783).

7378678121 is a wasteful number, since it uses less digits than its factorization.

7378678121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710011.

The product of its digits is 790272, while the sum is 50.

The square root of 7378678121 is about 85899.2323656038. The cubic root of 7378678121 is about 1946.8217453855.

The spelling of 7378678121 in words is "seven billion, three hundred seventy-eight million, six hundred seventy-eight thousand, one hundred twenty-one".