77407481 has 4 divisors (see below), whose sum is σ = 77425764. Its totient is φ = 77389200.

The previous prime is 77407471. The next prime is 77407523. The reversal of 77407481 is 18470477.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39891856 + 37515625 = 6316^2 + 6125^2 .

It is a cyclic number.

It is not a de Polignac number, because 77407481 - 2²² = 73213177 is a prime.

It is a super-2 number, since 2×77407481² = 11983836229530722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77407411) 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, 851 + ... + 12471.

It is an arithmetic number, because the mean of its divisors is an integer number (19356441).

Almost surely, 2^77407481 is an apocalyptic number.

It is an amenable number.

77407481 is a deficient number, since it is larger than the sum of its proper divisors (18283).

77407481 is a wasteful number, since it uses less digits than its factorization.

77407481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18282.

The product of its (nonzero) digits is 43904, while the sum is 38.

The square root of 77407481 is about 8798.1521355339. The cubic root of 77407481 is about 426.1812232694.

The spelling of 77407481 in words is "seventy-seven million, four hundred seven thousand, four hundred eighty-one".