77480819 has 16 divisors (see below), whose sum is σ = 85095360. Its totient is φ = 70118400.

The previous prime is 77480807. The next prime is 77480831. The reversal of 77480819 is 91808477.

It is an interprime number because it is at equal distance from previous prime (77480807) and next prime (77480831).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77480819 is a prime.

It is a super-2 number, since 2×77480819² = 12006554625821522, 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 77480819.

It is not an unprimeable number, because it can be changed into a prime (77480839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193019 + ... + 193419.

It is an arithmetic number, because the mean of its divisors is an integer number (5318460).

Almost surely, 2^77480819 is an apocalyptic number.

77480819 is a deficient number, since it is larger than the sum of its proper divisors (7614541).

77480819 is a wasteful number, since it uses less digits than its factorization.

77480819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 77480819 is about 8802.3189558207. The cubic root of 77480819 is about 426.3157727670.

The spelling of 77480819 in words is "seventy-seven million, four hundred eighty thousand, eight hundred nineteen".