155259978 has 8 divisors (see below), whose sum is σ = 310519968. Its totient is φ = 51753324.

The previous prime is 155259953. The next prime is 155259991. The reversal of 155259978 is 879952551.

It is a sphenic number, since it is the product of 3 distinct primes.

155259978 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 155259978.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12938326 + ... + 12938337.

It is an arithmetic number, because the mean of its divisors is an integer number (38814996).

Almost surely, 2^155259978 is an apocalyptic number.

155259978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

155259978 is a wasteful number, since it uses less digits than its factorization.

155259978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25876668.

The product of its digits is 1134000, while the sum is 51.

The square root of 155259978 is about 12460.3361912911. The cubic root of 155259978 is about 537.4686946253.

The spelling of 155259978 in words is "one hundred fifty-five million, two hundred fifty-nine thousand, nine hundred seventy-eight".