1217007428 has 48 divisors (see below), whose sum is σ = 2685212544. Its totient is φ = 469704960.

The previous prime is 1217007427. The next prime is 1217007433. The reversal of 1217007428 is 8247007121.

It is a happy number.

It is a super-2 number, since 2×1217007428² = 2962214159614350368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1217007394 and 1217007403.

It is not an unprimeable number, because it can be changed into a prime (1217007427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25850 + ... + 55697.

It is an arithmetic number, because the mean of its divisors is an integer number (55941928).

Almost surely, 2^1217007428 is an apocalyptic number.

It is an amenable number.

1217007428 is an abundant number, since it is smaller than the sum of its proper divisors (1468205116).

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

1217007428 is a wasteful number, since it uses less digits than its factorization.

1217007428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81612 (or 81610 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 1217007428 is about 34885.6335473501. The cubic root of 1217007428 is about 1067.6553393683.

The spelling of 1217007428 in words is "one billion, two hundred seventeen million, seven thousand, four hundred twenty-eight".