7477391749 has 4 divisors (see below), whose sum is σ = 7478849664. Its totient is φ = 7475933836.

The previous prime is 7477391717. The next prime is 7477391759. The reversal of 7477391749 is 9471937747.

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 7477391749 - 2⁵ = 7477391717 is a prime.

It is a super-2 number, since 2×7477391749² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7477391693 and 7477391702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7477391759) 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, 721237 + ... + 731530.

It is an arithmetic number, because the mean of its divisors is an integer number (1869712416).

Almost surely, 2^7477391749 is an apocalyptic number.

It is an amenable number.

7477391749 is a deficient number, since it is larger than the sum of its proper divisors (1457915).

7477391749 is a wasteful number, since it uses less digits than its factorization.

7477391749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457914.

The product of its digits is 9335088, while the sum is 58.

The square root of 7477391749 is about 86471.9130643008. The cubic root of 7477391749 is about 1955.4649896147.

The spelling of 7477391749 in words is "seven billion, four hundred seventy-seven million, three hundred ninety-one thousand, seven hundred forty-nine".