378687551 has 12 divisors (see below), whose sum is σ = 419426280. Its totient is φ = 339078960.

The previous prime is 378687509. The next prime is 378687559. The reversal of 378687551 is 155786873.

It is a de Polignac number, because none of the positive numbers 2^k-378687551 is a prime.

It is a super-2 number, since 2×378687551² = 286808522564755202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 378687551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378687559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45545 + ... + 53213.

It is an arithmetic number, because the mean of its divisors is an integer number (34952190).

Almost surely, 2^378687551 is an apocalyptic number.

378687551 is a deficient number, since it is larger than the sum of its proper divisors (40738729).

378687551 is an equidigital number, since it uses as much as digits as its factorization.

378687551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7814 (or 7747 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 50.

The square root of 378687551 is about 19459.8959658062. The cubic root of 378687551 is about 723.4807988374.

The spelling of 378687551 in words is "three hundred seventy-eight million, six hundred eighty-seven thousand, five hundred fifty-one".