73770921 has 27 divisors (see below), whose sum is σ = 124259031. Its totient is φ = 42051744.

The previous prime is 73770839. The next prime is 73770923. The reversal of 73770921 is 12907737.

The square root of 73770921 is 8589.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 67420521 + 6350400 = 8211^2 + 2520^2 .

It is not a de Polignac number, because 73770921 - 2²¹ = 71673769 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73770923) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 180165 + ... + 180573.

Almost surely, 2^73770921 is an apocalyptic number.

73770921 is the 8589-th square number.

73770921 is the 4295-th centered octagonal number.

It is an amenable number.

73770921 is a deficient number, since it is larger than the sum of its proper divisors (50488110).

73770921 is an equidigital number, since it uses as much as digits as its factorization.

73770921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The cubic root of 73770921 is about 419.3999765316.

Multiplying 73770921 by its sum of digits (36), we get a square (2655753156 = 51534²).

It can be divided in two parts, 73770 and 921, that added together give a triangular number (74691 = T₃₈₆).

The spelling of 73770921 in words is "seventy-three million, seven hundred seventy thousand, nine hundred twenty-one".