7479347978 has 4 divisors (see below), whose sum is σ = 11219021970. Its totient is φ = 3739673988.

The previous prime is 7479347957. The next prime is 7479348011. The reversal of 7479347978 is 8797439747.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8797439747 = 15809 ⋅556483.

It can be written as a sum of positive squares in only one way, i.e., 6939389809 + 539958169 = 83303^2 + 23237^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1869836993 + ... + 1869836996.

Almost surely, 2^7479347978 is an apocalyptic number.

7479347978 is a deficient number, since it is larger than the sum of its proper divisors (3739673992).

7479347978 is a wasteful number, since it uses less digits than its factorization.

7479347978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739673991.

The product of its digits is 74680704, while the sum is 65.

The square root of 7479347978 is about 86483.2236795091. The cubic root of 7479347978 is about 1955.6355037861.

The spelling of 7479347978 in words is "seven billion, four hundred seventy-nine million, three hundred forty-seven thousand, nine hundred seventy-eight".