77621331 has 8 divisors (see below), whose sum is σ = 104462784. Its totient is φ = 51263720.

The previous prime is 77621329. The next prime is 77621333. The reversal of 77621331 is 13312677.

It is an interprime number because it is at equal distance from previous prime (77621329) and next prime (77621333).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77621331 - 2¹ = 77621329 is a prime.

It is a super-2 number, since 2×77621331² = 12050142052423122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77621333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120585 + ... + 121226.

It is an arithmetic number, because the mean of its divisors is an integer number (13057848).

Almost surely, 2^77621331 is an apocalyptic number.

77621331 is a deficient number, since it is larger than the sum of its proper divisors (26841453).

77621331 is a wasteful number, since it uses less digits than its factorization.

77621331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241921.

The product of its digits is 5292, while the sum is 30.

The square root of 77621331 is about 8810.2968735452. The cubic root of 77621331 is about 426.5733260036.

The spelling of 77621331 in words is "seventy-seven million, six hundred twenty-one thousand, three hundred thirty-one".