15454640420 has 12 divisors (see below), whose sum is σ = 32454744924. Its totient is φ = 6181856160.

The previous prime is 15454640393. The next prime is 15454640497. The reversal of 15454640420 is 2404645451.

It can be written as a sum of positive squares in 2 ways, for example, as 7938097216 + 7516543204 = 89096^2 + 86698^2 .

It is a super-2 number, since 2×15454640420² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386365991 + ... + 386366030.

It is an arithmetic number, because the mean of its divisors is an integer number (2704562077).

Almost surely, 2^15454640420 is an apocalyptic number.

15454640420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15454640420 is an abundant number, since it is smaller than the sum of its proper divisors (17000104504).

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

15454640420 is a wasteful number, since it uses less digits than its factorization.

15454640420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772732030 (or 772732028 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

The spelling of 15454640420 in words is "fifteen billion, four hundred fifty-four million, six hundred forty thousand, four hundred twenty".