76470021 has 8 divisors (see below), whose sum is σ = 113288960. Its totient is φ = 50979996.

The previous prime is 76470007. The next prime is 76470059. The reversal of 76470021 is 12007467.

It is not a de Polignac number, because 76470021 - 2⁵ = 76469989 is a prime.

It is a super-2 number, since 2×76470021² = 11695328223480882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2832223 = 76470021 / (7 + 6 + 4 + 7 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76470091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416085 + ... + 1416138.

It is an arithmetic number, because the mean of its divisors is an integer number (14161120).

Almost surely, 2^76470021 is an apocalyptic number.

It is an amenable number.

76470021 is a deficient number, since it is larger than the sum of its proper divisors (36818939).

76470021 is a wasteful number, since it uses less digits than its factorization.

76470021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832232 (or 2832226 counting only the distinct ones).

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

The square root of 76470021 is about 8744.7138889732. The cubic root of 76470021 is about 424.4537776340.

Adding to 76470021 its reverse (12007467), we get a palindrome (88477488).

The spelling of 76470021 in words is "seventy-six million, four hundred seventy thousand, twenty-one".