77621001 has 4 divisors (see below), whose sum is σ = 103494672. Its totient is φ = 51747332.

The previous prime is 77620987. The next prime is 77621009. The reversal of 77621001 is 10012677.

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 77621001 - 2⁵ = 77620969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77621009) 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, 12936831 + ... + 12936836.

It is an arithmetic number, because the mean of its divisors is an integer number (25873668).

Almost surely, 2^77621001 is an apocalyptic number.

It is an amenable number.

77621001 is a deficient number, since it is larger than the sum of its proper divisors (25873671).

77621001 is a wasteful number, since it uses less digits than its factorization.

77621001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25873670.

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 77621001 is about 8810.2781454390. The cubic root of 77621001 is about 426.5727214902.

Adding to 77621001 its reverse (10012677), we get a palindrome (87633678).

The spelling of 77621001 in words is "seventy-seven million, six hundred twenty-one thousand, one".