427721640 has 64 divisors (see below), whose sum is σ = 1284716160. Its totient is φ = 113921280.

The previous prime is 427721627. The next prime is 427721641. The reversal of 427721640 is 46127724.

It is a super-4 number, since 4×427721640⁴ (a number of 36 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (427721641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132445 + ... + 135635.

It is an arithmetic number, because the mean of its divisors is an integer number (20073690).

Almost surely, 2^427721640 is an apocalyptic number.

427721640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

427721640 is an abundant number, since it is smaller than the sum of its proper divisors (856994520).

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

427721640 is a wasteful number, since it uses less digits than its factorization.

427721640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322 (or 4318 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 427721640 is about 20681.4322521435. The cubic root of 427721640 is about 753.4487923555.

The spelling of 427721640 in words is "four hundred twenty-seven million, seven hundred twenty-one thousand, six hundred forty".