155072990 has 8 divisors (see below), whose sum is σ = 279131400. Its totient is φ = 62029192.

The previous prime is 155072959. The next prime is 155072993. The reversal of 155072990 is 99270551.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155072993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7753640 + ... + 7753659.

It is an arithmetic number, because the mean of its divisors is an integer number (34891425).

Almost surely, 2^155072990 is an apocalyptic number.

155072990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155072990 is a deficient number, since it is larger than the sum of its proper divisors (124058410).

155072990 is a wasteful number, since it uses less digits than its factorization.

155072990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15507306.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 155072990 is about 12452.8306019154. The cubic root of 155072990 is about 537.2528403948.

The spelling of 155072990 in words is "one hundred fifty-five million, seventy-two thousand, nine hundred ninety".