7978550 has 12 divisors (see below), whose sum is σ = 14840196. Its totient is φ = 3191400.

The previous prime is 7978547. The next prime is 7978577. The reversal of 7978550 is 558797.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7978498 and 7978507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79736 + ... + 79835.

It is an arithmetic number, because the mean of its divisors is an integer number (1236683).

Almost surely, 2^7978550 is an apocalyptic number.

7978550 is a deficient number, since it is larger than the sum of its proper divisors (6861646).

7978550 is a wasteful number, since it uses less digits than its factorization.

7978550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159583 (or 159578 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 41.

The square root of 7978550 is about 2824.6327194876. The cubic root of 7978550 is about 199.8210900038.

The spelling of 7978550 in words is "seven million, nine hundred seventy-eight thousand, five hundred fifty".