7640293138 has 4 divisors (see below), whose sum is σ = 11460439710. Its totient is φ = 3820146568.

The previous prime is 7640293099. The next prime is 7640293147. The reversal of 7640293138 is 8313920467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8313920467 = 709 ⋅11726263.

It can be written as a sum of positive squares in only one way, i.e., 4950107449 + 2690185689 = 70357^2 + 51867^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7640293094 and 7640293103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1910073283 + ... + 1910073286.

Almost surely, 2^7640293138 is an apocalyptic number.

7640293138 is a deficient number, since it is larger than the sum of its proper divisors (3820146572).

7640293138 is a wasteful number, since it uses less digits than its factorization.

7640293138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820146571.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 7640293138 is about 87408.7703723145. The cubic root of 7640293138 is about 1969.5635902757.

The spelling of 7640293138 in words is "seven billion, six hundred forty million, two hundred ninety-three thousand, one hundred thirty-eight".