9778250815 has 8 divisors (see below), whose sum is σ = 11746041120. Its totient is φ = 7814507232.

The previous prime is 9778250771. The next prime is 9778250821. The reversal of 9778250815 is 5180528779.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9778250815 - 2¹³ = 9778242623 is a prime.

It is a super-2 number, since 2×9778250815² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1006360 + ... + 1016029.

It is an arithmetic number, because the mean of its divisors is an integer number (1468255140).

Almost surely, 2^9778250815 is an apocalyptic number.

9778250815 is a deficient number, since it is larger than the sum of its proper divisors (1967790305).

9778250815 is a wasteful number, since it uses less digits than its factorization.

9778250815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023361.

The product of its (nonzero) digits is 1411200, while the sum is 52.

The square root of 9778250815 is about 98885.0383779063. The cubic root of 9778250815 is about 2138.3907031486.

The spelling of 9778250815 in words is "nine billion, seven hundred seventy-eight million, two hundred fifty thousand, eight hundred fifteen".