1551233880 has 384 divisors, whose sum is σ = 6009569280. Its totient is φ = 339655680.

The previous prime is 1551233857. The next prime is 1551233897. The reversal of 1551233880 is 883321551.

1551233880 = T₂₇₁ + T₂₇₂ + ... + T₂₁₀₄.

1551233880 is a `hidden beast` number, since 1 + 551 + 23 + 3 + 8 + 80 = 666.

1551233880 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11841415 + ... + 11841545.

It is an arithmetic number, because the mean of its divisors is an integer number (15649920).

Almost surely, 2^1551233880 is an apocalyptic number.

1551233880 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 1551233880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3004784640).

1551233880 is an abundant number, since it is smaller than the sum of its proper divisors (4458335400).

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

1551233880 is a wasteful number, since it uses less digits than its factorization.

1551233880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1551233880 is about 39385.7065443798. The cubic root of 1551233880 is about 1157.6015345378.

The spelling of 1551233880 in words is "one billion, five hundred fifty-one million, two hundred thirty-three thousand, eight hundred eighty".