28742651440 has 20 divisors (see below), whose sum is σ = 66826664784. Its totient is φ = 11497060544.

The previous prime is 28742651387. The next prime is 28742651453. The reversal of 28742651440 is 4415624782.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×28742651440² (a number of 22 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, 179641492 + ... + 179641651.

Almost surely, 2^28742651440 is an apocalyptic number.

28742651440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28742651440 is an abundant number, since it is smaller than the sum of its proper divisors (38084013344).

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

28742651440 is a wasteful number, since it uses less digits than its factorization.

28742651440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359283156 (or 359283150 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 43.

The spelling of 28742651440 in words is "twenty-eight billion, seven hundred forty-two million, six hundred fifty-one thousand, four hundred forty".