7645042690 has 8 divisors (see below), whose sum is σ = 13761076860. Its totient is φ = 3058017072.

The previous prime is 7645042687. The next prime is 7645042739. The reversal of 7645042690 is 962405467.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6454033569 + 1191009121 = 80337^2 + 34511^2 .

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

It is a super-2 number, since 2×7645042690² (a number of 21 digits) contains 22 as substring.

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, 382252125 + ... + 382252144.

Almost surely, 2^7645042690 is an apocalyptic number.

7645042690 is a deficient number, since it is larger than the sum of its proper divisors (6116034170).

7645042690 is a wasteful number, since it uses less digits than its factorization.

7645042690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764504276.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 7645042690 is about 87435.9347751255. The cubic root of 7645042690 is about 1969.9716290245.

The spelling of 7645042690 in words is "seven billion, six hundred forty-five million, forty-two thousand, six hundred ninety".