377978081 has 4 divisors (see below), whose sum is σ = 407053332. Its totient is φ = 348902832.

The previous prime is 377978053. The next prime is 377978123. The reversal of 377978081 is 180879773.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180879773 = 89 ⋅2032357.

It can be written as a sum of positive squares in 2 ways, for example, as 58140625 + 319837456 = 7625^2 + 17884^2 .

It is a cyclic number.

It is not a de Polignac number, because 377978081 - 2¹⁸ = 377715937 is a prime.

It is a super-2 number, since 2×377978081² = 285734859432885122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (377978681) 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, 14537606 + ... + 14537631.

It is an arithmetic number, because the mean of its divisors is an integer number (101763333).

Almost surely, 2^377978081 is an apocalyptic number.

It is an amenable number.

377978081 is a deficient number, since it is larger than the sum of its proper divisors (29075251).

377978081 is a wasteful number, since it uses less digits than its factorization.

377978081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29075250.

The product of its (nonzero) digits is 592704, while the sum is 50.

The square root of 377978081 is about 19441.6583911970. The cubic root of 377978081 is about 723.0287033453.

The spelling of 377978081 in words is "three hundred seventy-seven million, nine hundred seventy-eight thousand, eighty-one".