77640046 has 16 divisors (see below), whose sum is σ = 128216880. Its totient is φ = 34966080.

The previous prime is 77640041. The next prime is 77640067. The reversal of 77640046 is 64004677.

It is a junction number, because it is equal to n+sod(n) for n = 77639993 and 77640020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77640041) 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, 13791 + ... + 18586.

It is an arithmetic number, because the mean of its divisors is an integer number (8013555).

Almost surely, 2^77640046 is an apocalyptic number.

77640046 is a deficient number, since it is larger than the sum of its proper divisors (50576834).

77640046 is a wasteful number, since it uses less digits than its factorization.

77640046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32499.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 77640046 is about 8811.3589190317. The cubic root of 77640046 is about 426.6076064356.

The spelling of 77640046 in words is "seventy-seven million, six hundred forty thousand, forty-six".