77401381 has 4 divisors (see below), whose sum is σ = 77431852. Its totient is φ = 77370912.

The previous prime is 77401367. The next prime is 77401427. The reversal of 77401381 is 18310477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18310477 = 41 ⋅446597.

It can be written as a sum of positive squares in 2 ways, for example, as 22137025 + 55264356 = 4705^2 + 7434^2 .

It is a cyclic number.

It is not a de Polignac number, because 77401381 - 2¹³ = 77393189 is a prime.

It is a super-2 number, since 2×77401381² = 11981947561414322, 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 (77401321) 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, 11040 + ... + 16633.

It is an arithmetic number, because the mean of its divisors is an integer number (19357963).

Almost surely, 2^77401381 is an apocalyptic number.

It is an amenable number.

77401381 is a deficient number, since it is larger than the sum of its proper divisors (30471).

77401381 is a wasteful number, since it uses less digits than its factorization.

77401381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30470.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 77401381 is about 8797.8054650009. The cubic root of 77401381 is about 426.1700280821.

The spelling of 77401381 in words is "seventy-seven million, four hundred one thousand, three hundred eighty-one".