7878069621428 has 48 divisors (see below), whose sum is σ = 14677930769040. Its totient is φ = 3686941310976.

The previous prime is 7878069621319. The next prime is 7878069621431. The reversal of 7878069621428 is 8241269608787.

It can be written as a sum of positive squares in 8 ways, for example, as 3809788689424 + 4068280932004 = 1951868^2 + 2016998^2 .

It is a super-2 number, since 2×7878069621428² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (68).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31718588 + ... + 31965996.

It is an arithmetic number, because the mean of its divisors is an integer number (305790224355).

Almost surely, 2^{7878069621428} is an apocalyptic number.

It is an amenable number.

7878069621428 is a deficient number, since it is larger than the sum of its proper divisors (6799861147612).

7878069621428 is a wasteful number, since it uses less digits than its factorization.

7878069621428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250004 (or 250002 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 68.

The spelling of 7878069621428 in words is "seven trillion, eight hundred seventy-eight billion, sixty-nine million, six hundred twenty-one thousand, four hundred twenty-eight".