77641919 has 4 divisors (see below), whose sum is σ = 77661240. Its totient is φ = 77622600.

The previous prime is 77641913. The next prime is 77641931. The reversal of 77641919 is 91914677.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77641919 - 2¹² = 77637823 is a prime.

It is a super-2 number, since 2×77641919² = 12056535172005122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77641919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77641913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1109 + ... + 12510.

It is an arithmetic number, because the mean of its divisors is an integer number (19415310).

Almost surely, 2^77641919 is an apocalyptic number.

77641919 is a deficient number, since it is larger than the sum of its proper divisors (19321).

77641919 is a wasteful number, since it uses less digits than its factorization.

77641919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19320.

The product of its digits is 95256, while the sum is 44.

The square root of 77641919 is about 8811.4652016563. The cubic root of 77641919 is about 426.6110369231.

The spelling of 77641919 in words is "seventy-seven million, six hundred forty-one thousand, nine hundred nineteen".