7981977040 has 40 divisors (see below), whose sum is σ = 19364974848. Its totient is φ = 3053973120.

The previous prime is 7981977001. The next prime is 7981977041. The reversal of 7981977040 is 407791897.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981977041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2167176 + ... + 2170855.

Almost surely, 2^7981977040 is an apocalyptic number.

It is an amenable number.

7981977040 is an abundant number, since it is smaller than the sum of its proper divisors (11382997808).

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

7981977040 is a wasteful number, since it uses less digits than its factorization.

7981977040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4338067 (or 4338061 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 52.

The square root of 7981977040 is about 89341.9108817357. The cubic root of 7981977040 is about 1998.4969573811.

The spelling of 7981977040 in words is "seven billion, nine hundred eighty-one million, nine hundred seventy-seven thousand, forty".