7961786406 has 32 divisors (see below), whose sum is σ = 20220410880. Its totient is φ = 2274796008.

The previous prime is 7961786387. The next prime is 7961786461. The reversal of 7961786406 is 6046871697.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10531086 + ... + 10531841.

It is an arithmetic number, because the mean of its divisors is an integer number (631887840).

Almost surely, 2^7961786406 is an apocalyptic number.

7961786406 is an abundant number, since it is smaller than the sum of its proper divisors (12258624474).

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

7961786406 is a wasteful number, since it uses less digits than its factorization.

7961786406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21062945 (or 21062939 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 7961786406 is about 89228.8429040745. The cubic root of 7961786406 is about 1996.8104499225.

The spelling of 7961786406 in words is "seven billion, nine hundred sixty-one million, seven hundred eighty-six thousand, four hundred six".