161278408 has 16 divisors (see below), whose sum is σ = 305515980. Its totient is φ = 79807488.

The previous prime is 161278387. The next prime is 161278409. The reversal of 161278408 is 804872161.

161278408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 161239204 + 39204 = 12698^2 + 198^2 .

It is not an unprimeable number, because it can be changed into a prime (161278409) 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, 103141 + ... + 104692.

Almost surely, 2^161278408 is an apocalyptic number.

It is an amenable number.

161278408 is a deficient number, since it is larger than the sum of its proper divisors (144237572).

161278408 is a wasteful number, since it uses less digits than its factorization.

161278408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207936 (or 207932 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 161278408 is about 12699.5436138469. The cubic root of 161278408 is about 544.3255782461.

The spelling of 161278408 in words is "one hundred sixty-one million, two hundred seventy-eight thousand, four hundred eight".