77721274 has 8 divisors (see below), whose sum is σ = 116643060. Its totient is φ = 38840256.

The previous prime is 77721257. The next prime is 77721277. The reversal of 77721274 is 47212777.

It can be written as a sum of positive squares in 2 ways, for example, as 60140025 + 17581249 = 7755^2 + 4193^2 .

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

It is not an unprimeable number, because it can be changed into a prime (77721277) 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, 4869 + ... + 13384.

Almost surely, 2^77721274 is an apocalyptic number.

77721274 is a deficient number, since it is larger than the sum of its proper divisors (38921786).

77721274 is a wasteful number, since it uses less digits than its factorization.

77721274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20384.

The product of its digits is 38416, while the sum is 37.

The square root of 77721274 is about 8815.9669917712. The cubic root of 77721274 is about 426.7563286772.

The spelling of 77721274 in words is "seventy-seven million, seven hundred twenty-one thousand, two hundred seventy-four".