83720970 has 48 divisors (see below), whose sum is σ = 225187560. Its totient is φ = 21555072.

The previous prime is 83720963. The next prime is 83720977. The reversal of 83720970 is 7902738.

It is an interprime number because it is at equal distance from previous prime (83720963) and next prime (83720977).

It can be written as a sum of positive squares in 4 ways, for example, as 83010321 + 710649 = 9111^2 + 843^2 .

It is not an unprimeable number, because it can be changed into a prime (83720977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13429 + ... + 18648.

Almost surely, 2^83720970 is an apocalyptic number.

83720970 is an abundant number, since it is smaller than the sum of its proper divisors (141466590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

83720970 is a wasteful number, since it uses less digits than its factorization.

83720970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32119 (or 32116 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 83720970 is about 9149.9163930606. The cubic root of 83720970 is about 437.4664485835.

The spelling of 83720970 in words is "eighty-three million, seven hundred twenty thousand, nine hundred seventy".