7890449680 has 40 divisors (see below), whose sum is σ = 18373770432. Its totient is φ = 3151281024.

The previous prime is 7890449663. The next prime is 7890449701. The reversal of 7890449680 is 869440987.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×7890449680² (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 7 ways as a sum of consecutive naturals, for example, 24462 + ... + 127981.

Almost surely, 2^7890449680 is an apocalyptic number.

It is an amenable number.

7890449680 is an abundant number, since it is smaller than the sum of its proper divisors (10483320752).

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

7890449680 is a wasteful number, since it uses less digits than its factorization.

7890449680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153103 (or 153097 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 7890449680 is about 88828.2031789454. The cubic root of 7890449680 is about 1990.8288156382.

The spelling of 7890449680 in words is "seven billion, eight hundred ninety million, four hundred forty-nine thousand, six hundred eighty".