378643686 has 32 divisors (see below), whose sum is σ = 803063808. Its totient is φ = 118608000.

The previous prime is 378643679. The next prime is 378643693. The reversal of 378643686 is 686346873.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (378643679) and next prime (378643693).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74131 + ... + 79073.

It is an arithmetic number, because the mean of its divisors is an integer number (25095744).

Almost surely, 2^378643686 is an apocalyptic number.

378643686 is an abundant number, since it is smaller than the sum of its proper divisors (424420122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

378643686 is a wasteful number, since it uses less digits than its factorization.

378643686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5716.

The product of its digits is 3483648, while the sum is 51.

The square root of 378643686 is about 19458.7688716424. The cubic root of 378643686 is about 723.4528631329.

The spelling of 378643686 in words is "three hundred seventy-eight million, six hundred forty-three thousand, six hundred eighty-six".