77240881 has 4 divisors (see below), whose sum is σ = 78884352. Its totient is φ = 75597412.

The previous prime is 77240869. The next prime is 77240897. The reversal of 77240881 is 18804277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77240881 - 2⁷ = 77240753 is a prime.

It is a super-2 number, since 2×77240881² = 11932307395312322, 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 77240881.

It is not an unprimeable number, because it can be changed into a prime (77240851) 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, 821665 + ... + 821758.

It is an arithmetic number, because the mean of its divisors is an integer number (19721088).

Almost surely, 2^77240881 is an apocalyptic number.

It is an amenable number.

77240881 is a deficient number, since it is larger than the sum of its proper divisors (1643471).

77240881 is a wasteful number, since it uses less digits than its factorization.

77240881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643470.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 77240881 is about 8788.6791385282. The cubic root of 77240881 is about 425.8752546057.

The spelling of 77240881 in words is "seventy-seven million, two hundred forty thousand, eight hundred eighty-one".