8978661 has 16 divisors (see below), whose sum is σ = 13761600. Its totient is φ = 5778864.

The previous prime is 8978639. The next prime is 8978663. The reversal of 8978661 is 1668798.

It is a happy number.

It is not a de Polignac number, because 8978661 - 2¹⁷ = 8847589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8978663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4951 + ... + 6516.

It is an arithmetic number, because the mean of its divisors is an integer number (860100).

Almost surely, 2^8978661 is an apocalyptic number.

It is an amenable number.

8978661 is a deficient number, since it is larger than the sum of its proper divisors (4782939).

8978661 is a wasteful number, since it uses less digits than its factorization.

8978661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11505 (or 11499 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 8978661 is about 2996.4413893817. The cubic root of 8978661 is about 207.8438562480.

The spelling of 8978661 in words is "eight million, nine hundred seventy-eight thousand, six hundred sixty-one".