1878615649 has 9 divisors (see below), whose sum is σ = 1903870227. Its totient is φ = 1853693424.

The previous prime is 1878615611. The next prime is 1878615677. The reversal of 1878615649 is 9465168781.

The square root of 1878615649 is 43343.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 360734049 + 1517881600 = 18993^2 + 38960^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1878615649 is a prime.

It is a Duffinian number.

Its product of digits (2903040) is a multiple of the sum of its prime divisors (576).

It is a self number, because there is not a number n which added to its sum of digits gives 1878615649.

It is not an unprimeable number, because it can be changed into a prime (1878615149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3857284 + ... + 3857770.

Almost surely, 2^1878615649 is an apocalyptic number.

1878615649 is the 43343-rd square number.

1878615649 is the 21672-nd centered octagonal number.

It is an amenable number.

1878615649 is a deficient number, since it is larger than the sum of its proper divisors (25254578).

1878615649 is an frugal number, since it uses more digits than its factorization.

1878615649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152 (or 576 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 55.

The cubic root of 1878615649 is about 1233.8981466490.

The spelling of 1878615649 in words is "one billion, eight hundred seventy-eight million, six hundred fifteen thousand, six hundred forty-nine".