7645120978 has 12 divisors (see below), whose sum is σ = 12604972590. Its totient is φ = 3475054880.

The previous prime is 7645120943. The next prime is 7645120993. The reversal of 7645120978 is 8790215467.

It can be written as a sum of positive squares in only one way, i.e., 6818960929 + 826160049 = 82577^2 + 28743^2 .

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 in 5 ways as a sum of consecutive naturals, for example, 15795463 + ... + 15795946.

Almost surely, 2^7645120978 is an apocalyptic number.

7645120978 is a deficient number, since it is larger than the sum of its proper divisors (4959851612).

7645120978 is a wasteful number, since it uses less digits than its factorization.

7645120978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31591433 (or 31591422 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

The square root of 7645120978 is about 87436.3824617647. The cubic root of 7645120978 is about 1969.9783534086.

The spelling of 7645120978 in words is "seven billion, six hundred forty-five million, one hundred twenty thousand, nine hundred seventy-eight".