77431401 has 6 divisors (see below), whose sum is σ = 111845370. Its totient is φ = 51620928.

The previous prime is 77431391. The next prime is 77431427. The reversal of 77431401 is 10413477.

It can be written as a sum of positive squares in only one way, i.e., 72233001 + 5198400 = 8499^2 + 2280^2 .

It is not a de Polignac number, because 77431401 - 2¹⁴ = 77415017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77431801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4301736 + ... + 4301753.

It is an arithmetic number, because the mean of its divisors is an integer number (18640895).

Almost surely, 2^77431401 is an apocalyptic number.

It is an amenable number.

77431401 is a deficient number, since it is larger than the sum of its proper divisors (34413969).

77431401 is a wasteful number, since it uses less digits than its factorization.

77431401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8603495 (or 8603492 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 77431401 is about 8799.5114068907. The cubic root of 77431401 is about 426.2251174119.

Adding to 77431401 its reverse (10413477), we get a palindrome (87844878).

The spelling of 77431401 in words is "seventy-seven million, four hundred thirty-one thousand, four hundred one".