155279020 has 144 divisors (see below), whose sum is σ = 400710240. Its totient is φ = 49932288.

The previous prime is 155278979. The next prime is 155279041. The reversal of 155279020 is 20972551.

It is a super-2 number, since 2×155279020² = 48223148104320800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3611119 + ... + 3611161.

It is an arithmetic number, because the mean of its divisors is an integer number (2782710).

Almost surely, 2^155279020 is an apocalyptic number.

155279020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155279020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200355120).

155279020 is an abundant number, since it is smaller than the sum of its proper divisors (245431220).

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

155279020 is a wasteful number, since it uses less digits than its factorization.

155279020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 155279020 is about 12461.1002724479. The cubic root of 155279020 is about 537.4906665046.

The spelling of 155279020 in words is "one hundred fifty-five million, two hundred seventy-nine thousand, twenty".