427691520 has 240 divisors, whose sum is σ = 1560770640. Its totient is φ = 107937792.

The previous prime is 427691497. The next prime is 427691533. The reversal of 427691520 is 25196724.

427691520 is a `hidden beast` number, since 42 + 7 + 6 + 91 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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 23 ways as a sum of consecutive naturals, for example, 437272 + ... + 438248.

It is an arithmetic number, because the mean of its divisors is an integer number (6503211).

Almost surely, 2^427691520 is an apocalyptic number.

427691520 is a gapful number since it is divisible by the number (40) 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 427691520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (780385320).

427691520 is an abundant number, since it is smaller than the sum of its proper divisors (1133079120).

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

427691520 is a wasteful number, since it uses less digits than its factorization.

427691520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025 (or 1006 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 427691520 is about 20680.7040499109. The cubic root of 427691520 is about 753.4311060784.

The spelling of 427691520 in words is "four hundred twenty-seven million, six hundred ninety-one thousand, five hundred twenty".