77220001 has 8 divisors (see below), whose sum is σ = 81979560. Its totient is φ = 72484608.

The previous prime is 77219969. The next prime is 77220029. The reversal of 77220001 is 10002277.

It can be written as a sum of positive squares in 4 ways, for example, as 24512401 + 52707600 = 4951^2 + 7260^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77220001 - 2⁵ = 77219969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77220601) 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, 775 + ... + 12451.

It is an arithmetic number, because the mean of its divisors is an integer number (10247445).

Almost surely, 2^77220001 is an apocalyptic number.

It is an amenable number.

77220001 is a deficient number, since it is larger than the sum of its proper divisors (4759559).

77220001 is a wasteful number, since it uses less digits than its factorization.

77220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12083.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 77220001 is about 8787.4911664251. The cubic root of 77220001 is about 425.8368764973.

Adding to 77220001 its reverse (10002277), we get a palindrome (87222278).

The spelling of 77220001 in words is "seventy-seven million, two hundred twenty thousand, one".