70828421 has 2 divisors, whose sum is σ = 70828422. Its totient is φ = 70828420.

The previous prime is 70828369. The next prime is 70828427. The reversal of 70828421 is 12482807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 22372900 = 6961^2 + 4730^2 .

It is a cyclic number.

It is not a de Polignac number, because 70828421 - 2⁶ = 70828357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70828427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35414210 + 35414211.

It is an arithmetic number, because the mean of its divisors is an integer number (35414211).

Almost surely, 2^70828421 is an apocalyptic number.

It is an amenable number.

70828421 is a deficient number, since it is larger than the sum of its proper divisors (1).

70828421 is an equidigital number, since it uses as much as digits as its factorization.

70828421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 70828421 is about 8415.9622741550. The cubic root of 70828421 is about 413.7479484386.

The spelling of 70828421 in words is "seventy million, eight hundred twenty-eight thousand, four hundred twenty-one".