7978697492 has 12 divisors (see below), whose sum is σ = 13963598880. Its totient is φ = 3989097816.

The previous prime is 7978697483. The next prime is 7978697513. The reversal of 7978697492 is 2947968797.

It is a super-2 number, since 2×7978697492² (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 3 ways as a sum of consecutive naturals, for example, 21323 + ... + 128109.

It is an arithmetic number, because the mean of its divisors is an integer number (1163633240).

Almost surely, 2^7978697492 is an apocalyptic number.

It is an amenable number.

7978697492 is a deficient number, since it is larger than the sum of its proper divisors (5984901388).

7978697492 is a wasteful number, since it uses less digits than its factorization.

7978697492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125470 (or 125468 counting only the distinct ones).

The product of its digits is 96018048, while the sum is 68.

The square root of 7978697492 is about 89323.5550792735. Note that the first 3 decimals coincide. The cubic root of 7978697492 is about 1998.2232129814.

The spelling of 7978697492 in words is "seven billion, nine hundred seventy-eight million, six hundred ninety-seven thousand, four hundred ninety-two".