2478078421 has 24 divisors (see below), whose sum is σ = 3121702584. Its totient is φ = 1949754240.

The previous prime is 2478078359. The next prime is 2478078479. The reversal of 2478078421 is 1248708742.

It can be written as a sum of positive squares in 4 ways, for example, as 350101521 + 2127976900 = 18711^2 + 46130^2 .

It is not a de Polignac number, because 2478078421 - 2¹⁷ = 2477947349 is a prime.

It is a super-2 number, since 2×2478078421² = 12281745321251706482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2478078481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104551 + ... + 126043.

It is an arithmetic number, because the mean of its divisors is an integer number (130070941).

Almost surely, 2^2478078421 is an apocalyptic number.

It is an amenable number.

2478078421 is a deficient number, since it is larger than the sum of its proper divisors (643624163).

2478078421 is a wasteful number, since it uses less digits than its factorization.

2478078421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21701 (or 21694 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 43.

The square root of 2478078421 is about 49780.3015358485. The cubic root of 2478078421 is about 1353.2302018781.

The spelling of 2478078421 in words is "two billion, four hundred seventy-eight million, seventy-eight thousand, four hundred twenty-one".