77779253 has 2 divisors, whose sum is σ = 77779254. Its totient is φ = 77779252.

The previous prime is 77779241. The next prime is 77779277. The reversal of 77779253 is 35297777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64288324 + 13490929 = 8018^2 + 3673^2 .

It is a cyclic number.

It is not a de Polignac number, because 77779253 - 2¹⁴ = 77762869 is a prime.

It is a super-2 number, since 2×77779253² = 12099224394476018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77779198 and 77779207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77739253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38889626 + 38889627.

It is an arithmetic number, because the mean of its divisors is an integer number (38889627).

Almost surely, 2^77779253 is an apocalyptic number.

It is an amenable number.

77779253 is a deficient number, since it is larger than the sum of its proper divisors (1).

77779253 is an equidigital number, since it uses as much as digits as its factorization.

77779253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648270, while the sum is 47.

The square root of 77779253 is about 8819.2546737239. The cubic root of 77779253 is about 426.8624204152.

The spelling of 77779253 in words is "seventy-seven million, seven hundred seventy-nine thousand, two hundred fifty-three".