649787378 has 8 divisors (see below), whose sum is σ = 976093680. Its totient is φ = 324422820.

The previous prime is 649787357. The next prime is 649787387. The reversal of 649787378 is 873787946.

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

It is a super-2 number, since 2×649787378² = 844447273216229768, which contains 22 as substring.

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, 233708 + ... + 236471.

It is an arithmetic number, because the mean of its divisors is an integer number (122011710).

Almost surely, 2^649787378 is an apocalyptic number.

649787378 is a deficient number, since it is larger than the sum of its proper divisors (326306302).

649787378 is a wasteful number, since it uses less digits than its factorization.

649787378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470872.

The product of its digits is 14224896, while the sum is 59.

The square root of 649787378 is about 25490.9273664180. The cubic root of 649787378 is about 866.1446429936.

The spelling of 649787378 in words is "six hundred forty-nine million, seven hundred eighty-seven thousand, three hundred seventy-eight".