2497181978 has 8 divisors (see below), whose sum is σ = 3750115968. Its totient is φ = 1247143324.

The previous prime is 2497181977. The next prime is 2497181983. The reversal of 2497181978 is 8791817942.

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

It is not an unprimeable number, because it can be changed into a prime (2497181971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721676 + ... + 725127.

It is an arithmetic number, because the mean of its divisors is an integer number (468764496).

Almost surely, 2^2497181978 is an apocalyptic number.

2497181978 is a deficient number, since it is larger than the sum of its proper divisors (1252933990).

2497181978 is a wasteful number, since it uses less digits than its factorization.

2497181978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447668.

The product of its digits is 2032128, while the sum is 56.

The square root of 2497181978 is about 49971.8118342731. The cubic root of 2497181978 is about 1356.6986639990.

The spelling of 2497181978 in words is "two billion, four hundred ninety-seven million, one hundred eighty-one thousand, nine hundred seventy-eight".