7861147640 has 32 divisors (see below), whose sum is σ = 17716304880. Its totient is φ = 3139352832.

The previous prime is 7861147627. The next prime is 7861147643. The reversal of 7861147640 is 467411687.

It is a junction number, because it is equal to n+sod(n) for n = 7861147591 and 7861147600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7861147643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134582 + ... + 183941.

Almost surely, 2^7861147640 is an apocalyptic number.

It is an amenable number.

7861147640 is an abundant number, since it is smaller than the sum of its proper divisors (9855157240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7861147640 is a wasteful number, since it uses less digits than its factorization.

7861147640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319151 (or 319147 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 7861147640 is about 88663.1131869392. The cubic root of 7861147640 is about 1988.3613725540.

The spelling of 7861147640 in words is "seven billion, eight hundred sixty-one million, one hundred forty-seven thousand, six hundred forty".