7978152990 has 16 divisors (see below), whose sum is σ = 19147567248. Its totient is φ = 2127507456.

The previous prime is 7978152971. The next prime is 7978153013. The reversal of 7978152990 is 992518797.

It is a self number, because there is not a number n which added to its sum of digits gives 7978152990.

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, 132969187 + ... + 132969246.

It is an arithmetic number, because the mean of its divisors is an integer number (1196722953).

Almost surely, 2^7978152990 is an apocalyptic number.

7978152990 is an abundant number, since it is smaller than the sum of its proper divisors (11169414258).

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

7978152990 is a wasteful number, since it uses less digits than its factorization.

7978152990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265938443.

The product of its (nonzero) digits is 2857680, while the sum is 57.

The square root of 7978152990 is about 89320.5071078305. The cubic root of 7978152990 is about 1998.1777560511.

The spelling of 7978152990 in words is "seven billion, nine hundred seventy-eight million, one hundred fifty-two thousand, nine hundred ninety".