427648969 has 10 divisors (see below), whose sum is σ = 470427050. Its totient is φ = 388758480.

The previous prime is 427648967. The next prime is 427648973. The reversal of 427648969 is 969846724.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 351750025 + 75898944 = 18755^2 + 8712^2 .

It is not a de Polignac number, because 427648969 - 2¹ = 427648967 is a prime.

It is a super-2 number, since 2×427648969² = 365767281373525922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427648967) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 37 + ... + 29245.

It is an arithmetic number, because the mean of its divisors is an integer number (47042705).

Almost surely, 2^427648969 is an apocalyptic number.

It is an amenable number.

427648969 is a deficient number, since it is larger than the sum of its proper divisors (42778081).

427648969 is an frugal number, since it uses more digits than its factorization.

427648969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29253 (or 29220 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The square root of 427648969 is about 20679.6752634078. The cubic root of 427648969 is about 753.4061189800.

The spelling of 427648969 in words is "four hundred twenty-seven million, six hundred forty-eight thousand, nine hundred sixty-nine".