155677890420 has 288 divisors, whose sum is σ = 541341964800. Its totient is φ = 35895011328.

The previous prime is 155677890409. The next prime is 155677890449. The reversal of 155677890420 is 24098776551.

155677890420 is a `hidden beast` number, since 1 + 5 + 5 + 67 + 78 + 90 + 420 = 666.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 3937269 + ... + 3976611.

It is an arithmetic number, because the mean of its divisors is an integer number (1879659600).

Almost surely, 2^155677890420 is an apocalyptic number.

155677890420 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 155677890420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270670982400).

155677890420 is an abundant number, since it is smaller than the sum of its proper divisors (385664074380).

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

155677890420 is a wasteful number, since it uses less digits than its factorization.

155677890420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39479 (or 39474 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 155677890420 in words is "one hundred fifty-five billion, six hundred seventy-seven million, eight hundred ninety thousand, four hundred twenty".