77474749 has 4 divisors (see below), whose sum is σ = 84517920. Its totient is φ = 70431580.

The previous prime is 77474737. The next prime is 77474759. The reversal of 77474749 is 94747477.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77474749 - 2⁵ = 77474717 is a prime.

It is a super-2 number, since 2×77474749² = 12004673465226002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77474759) 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, 3521569 + ... + 3521590.

It is an arithmetic number, because the mean of its divisors is an integer number (21129480).

Almost surely, 2^77474749 is an apocalyptic number.

It is an amenable number.

77474749 is a deficient number, since it is larger than the sum of its proper divisors (7043171).

77474749 is a wasteful number, since it uses less digits than its factorization.

77474749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043170.

The product of its digits is 1382976, while the sum is 49.

The square root of 77474749 is about 8801.9741535635. The cubic root of 77474749 is about 426.3046396705.

It can be divided in two parts, 7 and 7474749, that added together give a square (7474756 = 2734²).

The spelling of 77474749 in words is "seventy-seven million, four hundred seventy-four thousand, seven hundred forty-nine".