7545907978 has 12 divisors (see below), whose sum is σ = 13166839602. Its totient is φ = 3233960520.

The previous prime is 7545907973. The next prime is 7545907979. The reversal of 7545907978 is 8797095457.

It can be written as a sum of positive squares in only one way, i.e., 6766214049 + 779693929 = 82257^2 + 27923^2 .

It is not an unprimeable number, because it can be changed into a prime (7545907973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38499433 + ... + 38499628.

Almost surely, 2^7545907978 is an apocalyptic number.

7545907978 is a deficient number, since it is larger than the sum of its proper divisors (5620931624).

7545907978 is a wasteful number, since it uses less digits than its factorization.

7545907978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76999077 (or 76999070 counting only the distinct ones).

The product of its (nonzero) digits is 22226400, while the sum is 61.

The square root of 7545907978 is about 86867.1858528869. The cubic root of 7545907978 is about 1961.4195583508.

The spelling of 7545907978 in words is "seven billion, five hundred forty-five million, nine hundred seven thousand, nine hundred seventy-eight".