7678451978 has 8 divisors (see below), whose sum is σ = 11518076640. Its totient is φ = 3839093100.

The previous prime is 7678451953. The next prime is 7678451983. The reversal of 7678451978 is 8791548767.

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

It is a super-2 number, since 2×7678451978² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7678451978.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39683 + ... + 130121.

It is an arithmetic number, because the mean of its divisors is an integer number (1439759580).

Almost surely, 2^7678451978 is an apocalyptic number.

7678451978 is a deficient number, since it is larger than the sum of its proper divisors (3839624662).

7678451978 is a wasteful number, since it uses less digits than its factorization.

7678451978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132892.

The product of its digits is 23708160, while the sum is 62.

The square root of 7678451978 is about 87626.7766039582. The cubic root of 7678451978 is about 1972.8370897739.

The spelling of 7678451978 in words is "seven billion, six hundred seventy-eight million, four hundred fifty-one thousand, nine hundred seventy-eight".