770645091 has 4 divisors (see below), whose sum is σ = 1027526792. Its totient is φ = 513763392.

The previous prime is 770645087. The next prime is 770645093. The reversal of 770645091 is 190546077.

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

It is not a de Polignac number, because 770645091 - 2² = 770645087 is a prime.

It is a super-4 number, since 4×770645091⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (770645093) 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, 128440846 + ... + 128440851.

It is an arithmetic number, because the mean of its divisors is an integer number (256881698).

Almost surely, 2^770645091 is an apocalyptic number.

770645091 is a deficient number, since it is larger than the sum of its proper divisors (256881701).

770645091 is a wasteful number, since it uses less digits than its factorization.

770645091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256881700.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 770645091 is about 27760.4951504832. The cubic root of 770645091 is about 916.8215342676.

The spelling of 770645091 in words is "seven hundred seventy million, six hundred forty-five thousand, ninety-one".